I have the same problem after upgrading to Ubuntu 16.04 (from 14.04) a couple of months before. This is the most informative source I could find then - so I am hoping to revive this as it has been silent now for months.
For me, too, a fairly old, 32bit machine is affected:
Linux fliewatuet 4.4.0-51-generic #72-Ubuntu SMP Thu Nov 24 18:29:17 UTC 2016 i686 i686 i686 GNU/Linux
I am sure there are no (more) file permission problems (left) in the home directory (checked with find . ! -writable -a ! -path “/.git/” …). After reboot, with the problem (making sure the setting itself persists across boots):
gsettings get org.mate.session.required-components windowmanager
To be more exact: the problem does not occur on startup, but when logging in with mate. Some tests:
- Log in as affected user, do not fix window manager problem, log out, log in as not affected user, log out, log in as affected user: problem persists
- As above, but with fixing the window manager during first login: problem reappears.
So at least for me, this is a problem during initialization after login. These are my non-default settings for org.mate.marco.general:
… resetting these does not change anything though.
I know a simple reproduction now, but I am still lost on how to analyze this further: Where would I look for logs for this? syslog and Xorg seem clean. Help!