Fixed by comment #3
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https://bugs.launchpad.net/bugs/1760621
Title:
Tab freezes when I exit the shell
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The same on 17.04 and ThinkPad E570. After this "sudo modprobe -r
psmouse && sudo modprobe psmouse proto=imps" the touchpas works but with
libinput the middle button is dead.
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Public bug reported:
After random time (up to 2h) working with system, it freezes (in browser,
opening settings, working with files etc. ). Sometimes i can move with cursor.
SSH and Apache2 web server is always working. But i cannot restart desktop
manager due to xserver stuck in D state