I was using Linux Mint 18.1 just fine last week. When I turned my laptop today, the headphones were not working. Later, some keyboard functions, as lock screen shortcut also was not working.
Then I restarted the OS and when it came back, it was totally messed. There is no title bar, no panel (task bar).
Is there anything I can do, mostly by command line, to repair this?
EDIT: desktop environments available are cinnamon2d, cinnamon and xfce.