Ubuntu 16.04 LTS Desktop
After the graphical updater downloaded a ton of packages (around 3.5 GB in total) it started upgrading the system in place.
This did not went completely smooth, the installer complained about a missing package (ubuntu-desktop could not be configured due to missing dependencies).This had to be sorted out semi-manually with
sudo apt-get -f install.
The default theme (adwaita) was broken after the upgrade, leading to unpleasant transient issues with the desktop.
Apart from some glitches with the mouse and a manual upgrade to Mate 1.14, everything seemed to work more or less.
Installing a XBox360 controller kernel driver
Surprisingly, one new USB-device did not work out of the box and the kernel-driver needed patching.
See https://askubuntu.com/questions/695069/xbox-controller-blinking Option 1 for the solution, which worked for me:
sudo apt-add-repository ppa:mdeslaur/steamos/ sudo apt-get install steamos-xpad-dkms
Not perfect, but overall, it appears to work.
Some fine tuning is needed to get minor issues resolved.
More to come...