It does not start the MATE desktop environment

[joekamprad]

Users of optimus-manager, beware the python update!

There was a large amount of python updates. Now optimus-manager does not work. I got to the login screen and the monitor turned black, then flashed a bit with the cursor and then black to black and repeat. After arch-chroot and some thinking I removed Optimus-manager and now it works again. Just a heads up!