You have been subscribed to a public bug:
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. I did
the fresh install and it worked until I'd updated packages i.e. kernel
to version 4.10 from 4.8.
I've booted with the previous version of the kernel (4.8.0.36) and all
works fine.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.10.0-27-generic 4.10.0-27.30~16.04.2
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 26 19:43:11 2017
InstallationDate: Installed on 2017-07-26 (0 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.2)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: unity
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug xenial
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Can't reach greeter after lock screen
https://bugs.launchpad.net/bugs/1706713
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