Today I wanted to upgrade from LTS to LTS. I performed
update-manager -d
and started the upgrade. However, after having downloaded all files and running the installation, the upgrade failed, or at least it failed partially. There is some erroneous behavior regarding graphics and window management. The two screenshots show the behavior, something similar to what we know from Windows...
I had the hope, that an additional
apt-get update
apt-get upgrade
would install remaining (potentially missing) packages, but the list is quite empty
Get:1 http://de.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
Hit:2 http://archive.canonical.com/ubuntu xenial InRelease
Ign:3 http://archive.canonical.com precise InRelease
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:5 http://archive.canonical.com precise Release
Hit:7 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:8 http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
Fetched 247 kB in 1s (220 kB/s)
Reading package lists... Done
W: http://archive.canonical.com/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
and everything is installed. I have the impression, that I need to redo, or at least somehow continue the failed upgrade, but I don't know how to.
The two approaches I tried didn't yield anything:
sudo apt-get -f dist-upgrade
says, there is nothing to install. And
sudo update-manager -d
tells me, that I'm up to date.
Any ideas, how I can fix this problem?
After restarting multiple times, I notice that from time to time the applications also look differently, see the following screenshot. 
I think I fixed the error.
I reinstalled unity and ubuntu-desktop. I also had to enable desktop icons again (Ubuntu Tweak -> Tweaks -> Desktop Icons -> On). Everything looks normal again.
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