[Bug 1790633] [NEW] Lock screen has nno widget to enter password

[Chen Levy]

Public bug reported:

After today upgrade of:

Start-Date: 2018-09-04 12:06:31
Commandline: packagekit role='update-packages'
Upgrade:
libgpgmepp6:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2),
libpackagekit-glib2-18:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
libgpgme11:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2),
console-setup-linux:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
console-setup:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
packagekit-tools:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
packagekit:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
keyboard-configuration:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
gir1.2-packagekitglib-1.0:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
libqgpgme7:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2)

when I lock my screen with Ctrl-Alt-L I get the lock screen background image and nothing more.
I am unable to unlock the GUI.

I can go to a different virtual terminal with Ctrl+Alt+F2, but to get
back to the GUI I need to reboot the host.

I have a dual monitor setup with one monitor rotated at 90 degrees.
When I disconnect the rotated screen, I do get to see the password field and the unlock button, but I can't interact not with the keyboard nor with the mouse, and I am forced to reboot then too.

As a work around I disabled the automatic locking of the screen, but
this is not a secure solution.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: plasma-desktop 4:5.12.6-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Sep 4 15:18:02 2018
InstallationDate: Installed on 2018-03-20 (167 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
SourcePackage: plasma-desktop
UpgradeStatus: Upgraded to bionic on 2018-04-29 (128 days ago)

** Affects: plasma-desktop (Ubuntu)
Importance: Undecided
Status: New


** Tags: amd64 apport-bug bionic
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Title:
Lock screen has nno widget to enter password

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[Chen Levy]

I was able to reproduce this behavior with running manually
/usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet

Oddly enough the first time I ran it I did got the password prompt and
was able to unlock it and return to my desktop.

Running it again reproduced the reported issue, i.e. no password widget and thus no way to unlock it.
Killing kscreenlocker_greet from an other VT, didn't fix the issue, rather background became black, and only the mouse pointer was moving around.
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https://bugs.launchpad.net/bugs/1790633

Title:
Lock screen has nno widget to enter password

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[Chen Levy]

Update: sending sigint to the kscreenlock_greet made it trhow a message
on screen that instructed me to run `loginctl unlock-session 3` which
did unlocked the my screen.
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Title:
Lock screen has nno widget to enter password

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[Chen Levy]

Update: a better workaround is running from VT2 `pkill -sigint
screenlocker`, which make the password widget visible, and the screen
unlock-able.
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https://bugs.launchpad.net/bugs/1790633

Title:
Lock screen has nno widget to enter password

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https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1790633/+subscriptions

[Chen Levy]

Update: a better workaround is running from VT2 `pkill -sigint
screenlocker`, which make the password widget visible, and the screen
unlock-able.

I created a new user on the system, that use dosn't exhibit this issue
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Title:
Lock screen has nno widget to enter password

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[Chen Levy]

To resolve my issue, I created a new user, moved my ~/.kde/ ~/.config/
and ~/.cache/ out of the way, copied over the ~newuser/.kde/ and
~/newuser/.config/, and reconfigured the desktop by hand.

I don't yet know what was the root cause of this issue, and I am willing
to hand over my bad configuration file(s), to help resolve this issue.
Just ping me at ubuntu.com(at)chenlevy.com.
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https://bugs.launchpad.net/bugs/1790633

Title:
Lock screen has nno widget to enter password

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