Gnome screensaver lock always reports "incorrect password"

Bug #353356 reported by glass.dimly on 2009-04-01
62
This bug affects 12 people
Affects Status Importance Assigned to Milestone
gnome-screensaver (Ubuntu)
Low
Unassigned

Bug Description

Binary package hint: gnome-screensaver

When inactive, the screensaver locks the workstation. When logging back in, I enter my password. This always returns "incorrect password".

Workaround: hit "Switch User" log in as that same user with the denied password, revealing the session that was logged out of.

I changed the password: "sudo passwd". No change in behavior.

The question: where is it drawing the password from if not from the same place that the regular login derives it? And how can I fix this admittedly small but annoying problem?

Ed ODonnell (edodonnell) wrote :

What versions of Ubuntu, Gnome, and gnome-screensaver are affected?

Changed in gnome-screensaver (Ubuntu):
status: New → Incomplete
Saramburu (seba2005) wrote :

You can see the solution here: https://bugs.launchpad.net/ubuntu/+bug/299717

SOLUTION:
chown root:shadow /sbin/unix_chkpwd
chmod 2755 /sbin/unix_chkpwd
chown root:shadow /etc/shadow

Sebastien Bacher (seb128) wrote :

We are closing this bug report as it lacks the information, described in the previous comments, we need to investigate the problem further. However, please reopen it if you can give us the missing information and don't hesitate to submit bug reports in the future.

Changed in gnome-screensaver (Ubuntu):
importance: Undecided → Low
status: Incomplete → Invalid
JeromeQc (jeromestpierre) wrote :

I am experiencing the exact same issue and Saramburu solution doesn't work for me. It must be because of recent updates since this issue only started today and I was able to unlock my screen many times a day just recently.

This is a major problem for me since I have another bug when I switch sessions causing vertical green lines on my screen. The only workaround is to restart my X session and it made me loose my work setup each time. For now, I unchecked the screensaver option to lock the screen.

This is not related to the screensaver (in my case) because I also get this problem when locking the screen manually from the start menu.

What missing information do you need to be able to solve it? I can reproduce it easily.

I am on Jaunty Jackalope with Gnome 2.26.1.

It's a bit late XD, but try after Saramburu's commands:

sudo chmod g+r /etc/shadow

It worked for me ;)

Peter Muryshkin (jdoe666) wrote :

Observing same issue on Ubuntu 16.04 (after upgrading from 14.04 where same problem was appearing).

I consider that this effect is also there if you lock the screen manually.
Same workaround works:

- (lock screen manually; re-login says "wrong password"
- try to login as another user with wrong password
- after error, switch back to your user
- now login works

Changed in gnome-screensaver (Ubuntu):
status: Invalid → New
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in gnome-screensaver (Ubuntu):
status: New → Confirmed
Andrey Roenko (flapenguin) wrote :

Same issue on 18.04.

Sometimes, not always, lockscreen starts saying "wrong password".
Currently I'm fixing it via switching to a tty (ctl+alt+f1) and sending SIGTERM to everything that mention screensaver except for gsd-screensaver-proxy (simply via htop interface). After that workaround I'm sometimes stuck with a session that turns off my monitors every 30 seconds of inactivity.

It's really annoying.

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