2/15/18 compiz update broke unity
I have found a solution. apt-get fails to be able to handle the situation, but aptitude can handle it.
sudo aptitude install ubuntu-desktop
Note that the first solution offered by aptitude doesn't correct the problem, because that chooses not to install the package. I had to select no the first time, and then aptitude offered a second solution of downgrading the compiz packages that caused all the problems. The downgrade fixes the dependency problem, and then ubuntu-desktop and unity are reinstalled.
Very strange situation.
compiz-core-abiversion-20151010 is virtual on xenial and zesty, but it is provided by
$ apt-cache show compiz-core | grep "Version\|Provides\|Package" Package: compiz-core Version: 1:0.9.12.3+16.04.20180221-0ubuntu1 Provides: compiz-core-abiversion-20180221 Package: compiz-core Version: 1:0.9.12.2+16.04.20160415-0ubuntu1 Provides: compiz-core-abiversion-20151010
So APT and dpkg knows about both of them.
Full list of
compiz-core-abiversion family is as follows:
$ aptitude search compiz-core-abiversion- v compiz-core-abiversion-20151010 - v compiz-core-abiversion-20151010:i386 - v compiz-core-abiversion-20180221 - v compiz-core-abiversion-20180221:i386 -
Here as we know
compiz-core-abiversion-20151010 is not installable:
$ sudo apt-get install compiz-core-abiversion-20151010 Reading package lists... Done Building dependency tree Reading state information... Done Package compiz-core-abiversion-20151010 is a virtual package provided by: compiz-core 1:0.9.12.2+16.04.20160415-0ubuntu1 [Not candidate version] E: Package 'compiz-core-abiversion-20151010' has no installation candidate
But we can install newer (actual) version:
$ sudo apt-get install compiz-core-abiversion-20180221 Reading package lists... Done Building dependency tree Reading state information... Done Note, selecting 'compiz-core' instead of 'compiz-core-abiversion-20180221' The following additional packages will be installed: compiz-gnome compiz-plugins compiz-plugins-default libcompizconfig0 libdecoration0 libunity-core-6.0-9 unity unity-schemas unity-services The following packages will be upgraded: compiz-core compiz-gnome compiz-plugins compiz-plugins-default libcompizconfig0 libdecoration0 libunity-core-6.0-9 unity unity-schemas unity-services 10 upgraded, 0 newly installed, 0 to remove and 32 not upgraded. Need to get 5 302 kB of archives. After this operation, 278 kB of additional disk space will be used. Do you want to continue? [Y/n] n
So on normal consistent system all we need is to have all upgrades installed.
unity package was removed, we can install it with:
sudo aptitude update sudo aptitude safe-upgrade sudo aptitude install unity ubuntu-desktop
Note 1: My Ubuntu 16.04 LTS installations with Unity and MATE DE (1 clean xenial and and 3 old precise->trusty->xenial) work normally after regular upgrades without my intervention. All these systems did not tried to remove neither Unity nor
ubuntu-desktop during upgrades. And of course
xenial-proposed is disabled on my system, since I do not want to transform my Ubuntu LTS to bleeding-edge self-breakable ArchLinux.
Note 2: I edited my answer 2018-03-12 because of the fact that
compiz-core-abiversion-20170630 was removed from repositories.
Assuming you're logged in and your UI is stuck without unity, you can do the following:
- Go to tty4 using Ctrl+Alt+F4.
sudo apt install aptitude
sudo aptitude install unity
It will then tell you that there is a conflicting package. You answer
'n' and it will propose that you downgrade compiz. Go ahead and accept that.