我想学习llvm所以我必须在我的ubuntu 14.04中安装clang，但是我遇到了一些问题。这就是：
当我执行命令时：sudo apt-get install clang-3.5我只是收到一些错误信息，如下所示：
Reading package lists... Done Building dependency tree Reading
state information... Done Some packages could not be installed. This
may mean that you have requested an impossible situation or if you are
using the unstable distribution that some required packages have not
yet been created or been moved out of Incoming. The following
information may help to resolve the situation:
The following packages have unmet dependencies: clang-3.5 : Depends:
libclang1-3.5 (= 1:3.5~svn201651-1ubuntu1) but it is not going to be
installed
Depends: libobjc-4.8-dev but it is not going to be installed E: Unable to correct problems, you have held broken
packages.
然后我尝试安装libclang1-3.5，所以我执行命令：
sudo apt-get install libclang1-3.5
然后我收到了另一条错误消息：
Reading package lists... Done Building dependency tree Reading
state information... Done Some packages could not be installed. This
may mean that you have requested an impossible situation or if you are
using the unstable distribution that some required packages have not
yet been created or been moved out of Incoming. The following
information may help to resolve the situation:
The following packages have unmet dependencies: libclang1-3.5 :
Depends: libobjc-4.8-dev but it is not going to be installed E: Unable
to correct problems, you have held broken packages.
然后我执行命令：
sudo apt-get install libobjc-4.8-dev
这次收到错误消息：
The following packages have unmet dependencies: libobjc-4.8-dev :
Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1
is to be installed
Depends: libgcc-4.8-dev (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed
Depends: libobjc4 (>= 4.8.2-19ubuntu1) but it is not going to be installed E: Unable to correct problems, you have held
broken packages.
sudo apt-get install gcc-4.8-dev后的再次收到一些错误消息
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have unmet dependencies:
lib32gcc-4.8-dev : Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed
Depends: lib32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
libx32gcc-4.8-dev : Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed
Depends: lib32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: lib32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
Depends: libx32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我现在该怎么办？
============================================== 执行命令后sudo apt-get purge gcc *我收到了关注消息，似乎遇到了一些错误。
zhangkehu@ubuntu:/$ sudo apt-get purge gcc*
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'gcc-4.8-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'libx32gcc-4.7-dev' for regex 'gcc*'
Note, selecting 'libghc-gconf-dev' for regex 'gcc*'
Note, selecting 'gcompris-sound-pa' for regex 'gcc*'
Note, selecting 'libghc-libtagc-prof' for regex 'gcc*'
Note, selecting 'libgcc1-dbg-armel-cross' for regex 'gcc*'
Note, selecting 'gcj-4.8-jdk-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'libhfgcc1-armel-dcv1' for regex 'gcc*'
Note, selecting 'gcj-4.8-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'gcompris-sound-pt' for regex 'gcc*'
Note, selecting 'gccgo-4.7' for regex 'gcc*'
Note, selecting 'gccgo-4.8' for regex 'gcc*'
Note, selecting 'gccgo-4.9' for regex 'gcc*'
Note, selecting 'gcj-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'logcentral' for regex 'gcc*'
Note, selecting 'libgcc1-dbg-powerpc-cross' for regex 'gcc*'
Note, selecting 'gconf2' for regex 'gcc*'
Note, selecting 'gcc-4.4-locales' for regex 'gcc*'
Note, selecting 'gcompris-sound-ru' for regex 'gcc*'
Note, selecting 'gcc-4.4-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'lib32gcc-4.7-dev' for regex 'gcc*'
Note, selecting 'guile-gnome2-gconf' for regex 'gcc*'
Note, selecting 'gcovr' for regex 'gcc*'
Note, selecting 'gcal-common' for regex 'gcc*'
Note, selecting 'pulseaudio-module-gconf' for regex 'gcc*'
Note, selecting 'gcc-4.8-base' for regex 'gcc*'
Note, selecting 'java-gcj-compat' for regex 'gcc*'
Note, selecting 'gcompris-sound-sk' for regex 'gcc*'
Note, selecting 'gcompris-sound-sl' for regex 'gcc*'
Note, selecting 'libgcr-3-doc' for regex 'gcc*'
Note, selecting 'gcj-jre-headless' for regex 'gcc*'
Note, selecting 'gcompris-sound-so' for regex 'gcc*'
Note, selecting 'gcc-4.8-plugin-dev' for regex 'gcc*'
Note, selecting 'gcompris-sound-sr' for regex 'gcc*'
Note, selecting 'gcompris-sound-sv' for regex 'gcc*'
Note, selecting 'libghc-svgcairo-dev-0.12.1-becda' for regex 'gcc*'
Note, selecting 'libgcrypt-doc' for regex 'gcc*'
Note, selecting 'libtagc0-ruby' for regex 'gcc*'
Note, selecting 'gccgo-4.9-doc' for regex 'gcc*'
Note, selecting 'gcompris-sound-th' for regex 'gcc*'
Note, selecting 'libgcc1-armel-cross' for regex 'gcc*'
Note, selecting 'gcompris-sound-tr' for regex 'gcc*'
Note, selecting 'gcc-4.8-aarch64-linux-gnu-base' for regex 'gcc*'
Note, selecting 'gcc-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'kjumpingcube' for regex 'gcc*'
Note, selecting 'eclipse-rcp-gcj' for regex 'gcc*'
Note, selecting 'tagcoll' for regex 'gcc*'
Note, selecting 'gcc-4.8-source' for regex 'gcc*'
Note, selecting 'java-gcj-compat-headless' for regex 'gcc*'
Note, selecting 'gcompris' for regex 'gcc*'
Note, selecting 'libgconfmm-2.6-doc' for regex 'gcc*'
Note, selecting 'gcompris-sound-ur' for regex 'gcc*'
Note, selecting 'gcc-4.7-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'icedtea-gcjwebplugin' for regex 'gcc*'
Note, selecting 'gcc-4.4-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'gcc-mingw-w64-bootstrap' for regex 'gcc*'
Note, selecting 'gcc-4.8-multilib' for regex 'gcc*'
Note, selecting 'libtagc0-dev' for regex 'gcc*'
Note, selecting 'gconf-service-backend' for regex 'gcc*'
Note, selecting 'logcheck-database' for regex 'gcc*'
Note, selecting 'libgcc1-dbg-arm64-cross' for regex 'gcc*'
Note, selecting 'gcc-4.8-powerpc64le-linux-gnu-base' for regex 'gcc*'
Note, selecting 'lib32gcc1' for regex 'gcc*'
Note, selecting 'libhtml-tagcloud-perl' for regex 'gcc*'
Note, selecting 'gccgo' for regex 'gcc*'
Note, selecting 'gconf2-common' for regex 'gcc*'
Note, selecting 'python-pygccxml' for regex 'gcc*'
Note, selecting 'gcc-snapshot' for regex 'gcc*'
Note, selecting 'gcc-4.8-powerpc-linux-gnu-base' for regex 'gcc*'
Note, selecting 'gcc-4.6-multilib' for regex 'gcc*'
Note, selecting 'libsigc++-2.0-dev' for regex 'gcc*'
Note, selecting 'gcc-4.7-base' for regex 'gcc*'
Note, selecting 'libgc-dev' for regex 'gcc*'
Note, selecting 'libgconf2.0-cil-dev' for regex 'gcc*'
Note, selecting 'pulseaudio-module-gconf-dbg' for regex 'gcc*'
Note, selecting 'libgcc1-armhf-dcv1' for regex 'gcc*'
Note, selecting 'libx32gcc-4.8-dev' for regex 'gcc*'
Note, selecting 'libvomsjapi-java-gcj' for regex 'gcc*'
Note, selecting 'gcc-avr' for regex 'gcc*'
Note, selecting 'gcompris-data' for regex 'gcc*'
Note, selecting 'libghc-gconf-dev-0.12.1.1-4d3b6' for regex 'gcc*'
Note, selecting 'gcc-4.4-multilib' for regex 'gcc*'
Note, selecting 'libghc-svgcairo-prof' for regex 'gcc*'
Note, selecting 'gcc-4.6-doc' for regex 'gcc*'
Note, selecting 'libghc-gconf-doc' for regex 'gcc*'
Note, selecting 'gccgo-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'libsac-java-gcj' for regex 'gcc*'
Note, selecting 'fcitx-libs-gclient' for regex 'gcc*'
Note, selecting 'gcj-4.8-jdk-powerpc64le-linux-gnu' for regex 'gcc*'
Note, selecting 'libgnome2-gconf-perl' for regex 'gcc*'
Note, selecting 'gcal' for regex 'gcc*'
Note, selecting 'gcap' for regex 'gcc*'
Note, selecting 'libgcc1-arm64-cross' for regex 'gcc*'
Note, selecting 'libsigc++-1.1-dev' for regex 'gcc*'
Note, selecting 'gcj-jdk' for regex 'gcc*'
Note, selecting 'gcj-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'lib32gcc-4.8-dev' for regex 'gcc*'
Note, selecting 'colorgcc' for regex 'gcc*'
Note, selecting 'sagcad-doc' for regex 'gcc*'
Note, selecting 'libghc-svgcairo-dev' for regex 'gcc*'
Note, selecting 'lib64gcc1-powerpc-cross' for regex 'gcc*'
Note, selecting 'compizconfig-backend-gconf' for regex 'gcc*'
Note, selecting 'libgc1c2' for regex 'gcc*'
Note, selecting 'libgc1c3' for regex 'gcc*'
Note, selecting 'libgcc-4.8-dev-ppc64el-cross' for regex 'gcc*'
Note, selecting 'gcin-qt4-immodule' for regex 'gcc*'
Note, selecting 'gcompris-sound-ptbr' for regex 'gcc*'
Note, selecting 'gcc-4.6-base' for regex 'gcc*'
Note, selecting 'gcfilms' for regex 'gcc*'
Note, selecting 'libsigc++-2.0-0' for regex 'gcc*'
Note, selecting 'gccgo-4.8-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'git-remote-gcrypt' for regex 'gcc*'
Note, selecting 'gcc-arm-linux-gnueabi' for regex 'gcc*'
Note, selecting 'gcdw' for regex 'gcc*'
Note, selecting 'gcc-arm-none-eabi' for regex 'gcc*'
Note, selecting 'libgcc1-powerpc-cross' for regex 'gcc*'
Note, selecting 'libxmlsec1-gcrypt' for regex 'gcc*'
Note, selecting 'libqtgconf-dev' for regex 'gcc*'
Note, selecting 'libgcc1-armel-dcv1' for regex 'gcc*'
Note, selecting 'libhfgcc1-dbg-armel-cross' for regex 'gcc*'
Note, selecting 'gcc-4.5-arm-linux-gnueabi' for regex 'gcc*'
Note, selecting 'gcj-4.8-jdk' for regex 'gcc*'
Note, selecting 'libgcu-dbg' for regex 'gcc*'
Note, selecting 'libsfgcc1-armhf-dcv1' for regex 'gcc*'
Note, selecting 'gcc-opt' for regex 'gcc*'
Note, selecting 'xgc' for regex 'gcc*'
Note, selecting 'libsaxon-java-gcj' for regex 'gcc*'
Note, selecting 'gcc-4.6-source' for regex 'gcc*'
Note, selecting 'libgcc1-dbg' for regex 'gcc*'
Note, selecting 'python-argcomplete' for regex 'gcc*'
Note, selecting 'libsigc++-1.9-0' for regex 'gcc*'
Note, selecting 'gcc-4.7-arm-linux-gnueabihf-base' for regex 'gcc*'
Note, selecting 'libextutils-pkgconfig-perl' for regex 'gcc*'
Note, selecting 'gccgo-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'gcc-4.7-arm-linux-gnueabi' for regex 'gcc*'
Note, selecting 'libghc-libtagc-prof-0.12.0-7e84b' for regex 'gcc*'
Note, selecting 'gcstar' for regex 'gcc*'
Note, selecting 'fcitx-table-bingchan' for regex 'gcc*'
Note, selecting 'gccgo-multilib' for regex 'gcc*'
Note, selecting 'libgconf2-dev' for regex 'gcc*'
Note, selecting 'pngcrush' for regex 'gcc*'
Note, selecting 'lib64gcc1-dbg-powerpc-cross' for regex 'gcc*'
Note, selecting 'gccgo-4.8-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'libsigc++-2.0-doc' for regex 'gcc*'
Note, selecting 'libgcc1' for regex 'gcc*'
Note, selecting 'libgcc-4.7-dev-armhf-cross' for regex 'gcc*'
Note, selecting 'gcc-mingw-w64-base' for regex 'gcc*'
Note, selecting 'gcc-4.7-doc' for regex 'gcc*'
Note, selecting 'gcc-docs' for regex 'gcc*'
Note, selecting 'libsigc++-2.0-0c2a' for regex 'gcc*'
Note, selecting 'gcin' for regex 'gcc*'
Note, selecting 'libtagc0-ruby1.8' for regex 'gcc*'
Note, selecting 'llvm-gcc' for regex 'gcc*'
Note, selecting 'libgctp-dev' for regex 'gcc*'
Note, selecting 'pngcheck' for regex 'gcc*'
Note, selecting 'nagcon' for regex 'gcc*'
Note, selecting 'libgctp0d' for regex 'gcc*'
Note, selecting 'gcc-multilib' for regex 'gcc*'
Note, selecting 'r-cran-mgcv' for regex 'gcc*'
Note, selecting 'lib64gcc1-powerpc-dcv1' for regex 'gcc*'
Note, selecting 'gccgo-4.8-multilib' for regex 'gcc*'
Note, selecting 'libsigc++-2.0-0c2' for regex 'gcc*'
Note, selecting 'libdesktop-agnostic-cfg-gconf' for regex 'gcc*'
Note, selecting 'gcin-tables' for regex 'gcc*'
Note, selecting 'libgcj14-dev' for regex 'gcc*'
Note, selecting 'gcompris-sound-fi' for regex 'gcc*'
Note, selecting 'libswt3.2-gtk-gcj' for regex 'gcc*'
Note, selecting 'gccgo-doc' for regex 'gcc*'
Note, selecting 'gcompris-sound-fr' for regex 'gcc*'
Note, selecting 'gcc-4.8-multilib-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'libghc-gconf-prof-0.12.1.1-4d3b6' for regex 'gcc*'
Note, selecting 'eclipse-jdt-gcj' for regex 'gcc*'
Note, selecting 'gcj-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'gcalcli' for regex 'gcc*'
Note, selecting 'gcompris-sound-gd' for regex 'gcc*'
Note, selecting 'ggcov' for regex 'gcc*'
Note, selecting 'gcj-4.4' for regex 'gcc*'
Note, selecting 'gcj-4.8' for regex 'gcc*'
Note, selecting 'libgcc1-ppc64el-cross' for regex 'gcc*'
Note, selecting 'libxerces2-java-gcj' for regex 'gcc*'
Note, selecting 'ant-optional-gcj' for regex 'gcc*'
Note, selecting 'gcj-4.4-base' for regex 'gcc*'
Note, selecting 'libgcr-dev' for regex 'gcc*'
Note, selecting 'gcompris-sound-he' for regex 'gcc*'
Note, selecting 'gcompris-sound-hi' for regex 'gcc*'
Note, selecting 'gcc-4.4-doc' for regex 'gcc*'
Note, selecting 'gir1.2-gck-1' for regex 'gcc*'
Note, selecting 'gcc-4.8-locales' for regex 'gcc*'
Note, selecting 'gcompris-sound-hu' for regex 'gcc*'
Note, selecting 'libsigc++-1.2-5c102' for regex 'gcc*'
Note, selecting 'gcc-mingw-w64-i686' for regex 'gcc*'
Note, selecting 'gcu-plugin' for regex 'gcc*'
Note, selecting 'gccgo-4.9-multilib' for regex 'gcc*'
Note, selecting 'gcc-4.7-multilib-arm-linux-gnueabi' for regex 'gcc*'
Note, selecting 'gcompris-sound-id' for regex 'gcc*'
Note, selecting 'gcj-4.8-jre-lib' for regex 'gcc*'
Note, selecting 'logcheck' for regex 'gcc*'
Note, selecting 'libgconf-bridge-dev' for regex 'gcc*'
Note, selecting 'gccgo-4.7-arm-linux-gnueabi' for regex 'gcc*'
Note, selecting 'gcompris-sound-it' for regex 'gcc*'
Note, selecting 'libgcr-3-dev' for regex 'gcc*'
Note, selecting 'gcin-chewing' for regex 'gcc*'
Note, selecting 'libgcrypt-dev' for regex 'gcc*'
Note, selecting 'gcc-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'gcj-4.8-jre-headless' for regex 'gcc*'
Note, selecting 'gcin-data' for regex 'gcc*'
Note, selecting 'gcc-4.8-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'eclipse-platform-gcj' for regex 'gcc*'
Note, selecting 'gccgo-4.7-multilib' for regex 'gcc*'
Note, selecting 'gcolor2' for regex 'gcc*'
Note, selecting 'gcc-4.5-arm-linux-gnueabihf' for regex 'gcc*'
Note, selecting 'gccgo-4.8-aarch64-linux-gnu' for regex 'gcc*'
Note, selecting 'gconf' for regex 'gcc*'
Note, selecting 'gcc-powerpc64le-linux-gnu' for regex 'gcc*'
Note, selecting 'gcc-4.5-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'gcc-4.7-arm-linux-gnueabi-base' for regex 'gcc*'
Note, selecting 'gcc-4.8-arm-linux-gnueabihf-base' for regex 'gcc*'
Note, selecting 'libgcal0' for regex 'gcc*'
Note, selecting 'gcj-powerpc64le-linux-gnu' for regex 'gcc*'
Note, selecting 'libgcr-base-3-1' for regex 'gcc*'
Note, selecting 'gccgo-4.8-doc' for regex 'gcc*'
Note, selecting 'libghc-uuagc-cabal-doc' for regex 'gcc*'
Note, selecting 'gceph' for regex 'gcc*'
Note, selecting 'libgconfmm-2.6-dev' for regex 'gcc*'
Note, selecting 'gcin-gtk3-immodule' for regex 'gcc*'
Note, selecting 'gcc-m68hc1x' for regex 'gcc*'
Note, selecting 'libgcc-4.8-dev-armhf-cross' for regex 'gcc*'
Note, selecting 'libghc-svgcairo-prof-0.12.1-becda' for regex 'gcc*'
Note, selecting 'gir1.0-gconf-2.0' for regex 'gcc*'
Note, selecting 'gcompris-sound-lt' for regex 'gcc*'
Note, selecting 'gcrystal' for regex 'gcc*'
Note, selecting 'libxml-commons-resolver1.1-java-gcj' for regex 'gcc*'
Note, selecting 'eclipse-pde-gcj' for regex 'gcc*'
Note, selecting 'libsfgcc1-dbg-armhf-cross' for regex 'gcc*'
Note, selecting 'libgconfmm-2.6-1c2' for regex 'gcc*'
Note, selecting 'libghc-uuagc-cabal-dev-1.0.4.0-b5c8b' for regex 'gcc*'
Note, selecting 'logcentral-tools' for regex 'gcc*'
Note, selecting 'gcc-4.6-locales' for regex 'gcc*'
Note, selecting 'gccgo-4.8-powerpc64le-linux-gnu' for regex 'gcc*'
Note, selecting 'gcompris-sound-mr' for regex 'gcc*'
Note, selecting 'libgcrypt11-doc' for regex 'gcc*'
Note, selecting 'gcl-doc' for regex 'gcc*'
Note, selecting 'gcc-4.8-multilib-powerpc-linux-gnu' for regex 'gcc*'
Note, selecting 'libgcrypt11' for regex 'gcc*'
Note, selecting 'gcompris-sound-nb' for regex 'gcc*'
Note, selecting 'libtagc0' for regex 'gcc*'
Note, selecting 'gcompris-sound-ast' for regex 'gcc*'
Note, selecting 'libghc-gconf-prof' for regex 'gcc*'
Note, selecting 'gcompris-sound-nl' for regex 'gcc*'
Note, selecting 'libgcr-3-common' for regex 'gcc*'
Note, selecting 'gcompris-sound-nn' for regex 'gcc*'
Note, selecting 'gcc-4.9-base' for regex 'gcc*'
Note, selecting 'libgcj11' for regex 'gcc*'
Note, selecting 'ecj-bootstrap-gcj' for regex 'gcc*'
Note, selecting 'librepository-java-gcj' for regex 'gcc*'
Note, selecting 'libgcj14' for regex 'gcc*'
Note, selecting 'libgcr-ui-3-1' for regex 'gcc*'
Note, selecting 'gccgo-go' for regex 'gcc*'
Note, selecting 'libsfgcc-4.7-dev-armhf-cross' for regex 'gcc*'
Note, selecting 'libgck-1-doc' for regex 'gcc*'
Package 'libjaxp1.3-java-gcj' is not installed, so not removed
Package 'libsaxon-java-gcj' is not installed, so not removed
Package 'libsigc++-2.0-dev' is not installed, so not removed
Package 'libsigc++-2.0-doc' is not installed, so not removed
Package 'libtagc0' is not installed, so not removed
Package 'libtagc0-dev' is not installed, so not removed
Package 'libtagcoll2-dev' is not installed, so not removed
Package 'libx32gcc-4.7-dev' is not installed, so not removed
Package 'libx32gcc-4.8-dev' is not installed, so not removed
Package 'libx32gcc1' is not installed, so not removed
Package 'libx32gcc1-dbg' is not installed, so not removed
Package 'libxerces2-java-gcj' is not installed, so not removed
Package 'libxml-commons-resolver1.1-java-gcj' is not installed, so not removed
Package 'logcheck' is not installed, so not removed
Package 'logcheck-database' is not installed, so not removed
Package 'pulseaudio-module-gconf' is not installed, so not removed
Package 'pulseaudio-module-gconf-dbg' is not installed, so not removed
Package 'colorgcc' is not installed, so not removed
Package 'compizconfig-backend-gconf' is not installed, so not removed
Package 'docbook-xsl-saxon-gcj' is not installed, so not removed
Package 'fcitx-libs-gclient' is not installed, so not removed
Package 'fcitx-table-bingchan' is not installed, so not removed
Package 'gcal' is not installed, so not removed
Package 'gcal-common' is not installed, so not removed
Package 'gcalcli' is not installed, so not removed
WARNING: The following essential packages will be removed.
This should NOT be done unless you know exactly what you are doing!
apt libapt-pkg4.12 (due to apt) libc6 (due to apt) libgcc1 (due to apt) libstdc++6 (due to apt) gnupg (due to apt) base-files base-passwd libdebconfclient0 (due to base-passwd) bash debianutils (due to
bash) dash (due to bash) libtinfo5 (due to bash) bsdutils coreutils libacl1 (due to coreutils) libattr1 (due to coreutils) libselinux1 (due to coreutils) dpkg (due to dash) diffutils libbz2-1.0 (due to
dpkg) liblzma5 (due to dpkg) zlib1g (due to dpkg) tar (due to dpkg) e2fsprogs e2fslibs (due to e2fsprogs) libblkid1 (due to e2fsprogs) libcomerr2 (due to e2fsprogs) libss2 (due to e2fsprogs) libuuid1
(due to e2fsprogs) util-linux (due to e2fsprogs) findutils grep install-info (due to grep) libpcre3 (due to grep) gzip hostname libc-bin libcap2 (due to libc-bin) login libpam0g (due to login)
libpam-runtime (due to login) libpam-modules (due to login) mount libmount1 (due to mount) ncurses-bin perl-base sed tzdata (due to util-linux) debconf (due to util-linux) sysv-rc (due to util-linux)
libncurses5 (due to util-linux) libslang2 (due to util-linux)
0 upgraded, 0 newly installed, 1636 to remove and 0 not upgraded.
After this operation, 3,222 MB disk space will be freed.
You are about to do something potentially harmful.
To continue type in the phrase 'Yes, do as I say!'
?] yes
Abort.
答案 0 :(得分：1)
尝试使用以下命令修复损坏的软件包：
sudo apt-get update
sudo apt upgrade
dpkg --get-selections | grep hold
sudo apt-get autoremove
看看它是否有效。
编辑： 你也可以尝试这些命令
sudo apt-get autoclean
apt-get clear cache
编辑＃2：
使用文本编辑器编辑/etc/apt/sources.list文件，使其具有以下内容：
#------------------------------------------------------------------------------#
# OFFICIAL UBUNTU REPOS #
#------------------------------------------------------------------------------#
###### Ubuntu Main Repos
deb http://us.archive.ubuntu.com/ubuntu/ trusty main universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main universe
###### Ubuntu Update Repos
deb http://us.archive.ubuntu.com/ubuntu/ trusty-security main universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-security main universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main universe
###### Ubuntu Partner Repo
deb-src http://archive.canonical.com/ubuntu trusty partner
###### Ubuntu Extras Repo
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
###### For LLVM
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main
（注意：在修改之前创建sources.list的备份总是好的）
之后运行此帖子顶部的所有命令（sudo apt-get update ... sudo apt uprgrade ... etc..etc ..）。然后运行命令下载llvm。希望它有效。