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enter image description here

When I try to lock the screen it just freezes. It is not possible to log on again. It used to work perfectly and suddenly it does not. However, I am not aware of any recent updates or similar.

I would try to reinstall the component that is responsible for locking the screen. Which one would that be?

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  • @PRATAP yes, but with the same buggy behavior – Christian Jan 25 '19 at 15:15
  • I exactly followed these steps and it solved the problem. – Christian Jan 25 '19 at 15:35
  • Unfortunately, the problem appeared again. – Christian Jan 27 '19 at 20:53
  • Seems like I have the same problem. Ctrl-Alt-F1 helps temporarily, as it allows me to log in back. But I'd like a proper fix. Also applications dock (on the left) breaks at the same time. Unfortunately, I haven't noticed which particular update brought this behavior, but it was something from last month. And I have it on two different machines, both ubuntu 18.04. – Imaskar Jan 31 '19 at 8:43
  • Update the system with sudo apt update && sudo apt upgrade or you can do fresh installation of 18.04.2. – d a i s y Jan 31 '19 at 9:45
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You can track the bug here. Dash to Dock Gnome extension is causing it.

Upgrading packages helped for me.

Also known temporary workarounds:

  1. Ctrl+Alt+F1 after locking to repaint screen.
  2. Win+L twice to hide screen content (the dock will still be visible, though)
  3. after logging back Alt+F2, type r, enter. To reset Gnome and fix broken dock.
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  • 2
    It seems more likely to be correct but not a proper answer and seems as comment. Please provide a detail answer with describing which package to upgrade and how to otherwise it will be deleted. – d a i s y Jan 31 '19 at 9:57
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    The bug was in dash-to-dock. I don't know which package contains it, probably gnome-software. Just update all packages. Deleting the only answer is surely useful thing to do, go on. – Imaskar Jan 31 '19 at 12:08
  • I realized that the upgrade fixed almost the problem, but if the laptop is docked I still have it. – Natim Feb 1 '19 at 8:44
  • Trying to upgrade to linux-headers-4.15.0-45-generic – Natim Feb 1 '19 at 8:45
  • Upgrading kernel won't help. Try installing latest dash to dock or disable it completely. Also note, that ubuntu dock is a derivative of dash to dock, so take a look at it, if it is enabled in your system (it is optional). – Imaskar Feb 1 '19 at 9:11
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Might be related to this bug: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1656658

I've been getting a lot of screen hangs.

try opening a terminal and enter $dmesg -w

This will show you the last error... also consider getting your sys info with $inxi -Fxz

good luck!

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