我想要升级系统，但是有问题。
# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
python-gnupginterface : Depends: python-support (>= 0.90.0) but it is not installable
python-pycurl : Depends: python-support (>= 0.90.0) but it is not installable
python-software-properties : Depends: unattended-upgrades but it is not installed
E: Unmet dependencies. Try using -f.
# apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... failed.
The following packages have unmet dependencies:
python-gnupginterface : Depends: python-support (>= 0.90.0) but it is not installable
python-pycurl : Depends: python-support (>= 0.90.0) but it is not installable
python-software-properties : Depends: unattended-upgrades but it is not installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies
# dpkg --audit | more
The following packages are only half configured, probably due to problems
configuring them the first time. The configuration should be retried using
dpkg --configure <package> or the configure menu option in dselect:
python-pkg-resources Package Discovery and Resource Access using pkg_resources
python-dbus simple interprocess messaging system (Python interface)
lsb-release Linux Standard Base version reporting utility
python-gnupginterface Python interface to GnuPG (GPG)
python-gi Python 2.x bindings for gobject-introspection libraries
python-software-properties manage the repositories that you install software f
python-pycurl Python bindings to libcurl
software-properties-common manage the repositories that you install software f
python-apt Python interface to libapt-pkg
python-setuptools Python Distutils Enhancements (setuptools compatibility)