Ubuntu: Can't unlock screen


Several days ago I faced a problem: after locking screen with Alt+Ctrl+L the screen turns off as expected, but when I try to wake it (move mouse, press any button) and type password the screen turns on but I only see black screen and cursor on it. I have to reboot computer and login again.

I tried to call Alt+Ctrl+F7 and so on, but nothing helps.

Some days ago I've changed vm.swappiness parameter with command sudo sysctl -w vm.swappiness=10. Maybe it cause the problem. I use Linux 4.10.0-27-generic #30~16.04.2-Ubuntu SMP Thanks.

UPD: Another way to awake it is to run systemctl restart lightdm

UPD: I did the fresh install and it worked until I'd updated packages. One of them cause the problem. How can I detect which of them?

UPD: All packages have been updated (http://pastebin.ubuntu.com/25177450/), which of them can cause the problem?

UPD: I've booted with the previous version of the kernel ( and all works fine. What should I do now? Should I write bugreport or something else?


Link to bug on Launchpad: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1706713


So, as booting to previous version of the kernel helped me I suppose it's a bug.

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