我按照here的说明操作（参见Ubuntu部分）。它说我要做
sudo add-apt-repository ppa:staticfloat/juliareleases
sudo add-apt-repository ppa:staticfloat/julia-deps
sudo apt-get update
然后是命令
sudo apt-get install julia
给我
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:
julia : Depends: libcholmod1.7.1 but it is not installable or
libcholmod2.1.2 but it is not installable or
libcholmod3.0.6 but it is not installable
Depends: libumfpack5.4.0 but it is not installable or
libumfpack5.6.2 but it is not installable or
libumfpack5.7.1 but it is not installable
E: Unable to correct problems, you have held broken packages.
我正在使用Xubuntu 16.10。
你能帮我理解发生了什么以及如何解决它吗？