I successfully installed Ubuntu on a Lenovo 720 15". When I go to reboot or shut down, it just hangs on a black screen for a very long time. Does anyone else have this problem? Any ideas as to how to fix it? Unfortunately it does not seem to be outputting any errors to the screen.
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Until you solve the problem you can reboot/shutdown gracefully with the SysRq REISUB method according to this link, Restart Ubuntu via keyboard – sudodus Apr 14 '18 at 04:55