19

I'm on Ubuntu 18.04 and since today whenever I lock my system and try to log back in using my password, it shows the 'in progress' spinner for few seconds then I get the error message "Authentication error". I can successfully log in on the first start though.

I have tried to force disable Wayland by uncommenting the line #WaylandEnable=false to WaylandEnable=false in /etc/gdm3/custom.conf but it had no effect. I was originally using Xorg as well.

I've checked for any available system updates in hope of getting a fix but none are available. What can I do to investigate into and fix this error?

Update: I re-installed Ubuntu 18.04 to get rid of the issue.

  • 1
    No responses! Is there really nothing that can be done? The upvotes indicate that others are facing this issue as well. Well, after spending about 3 hours trying to resolve this, I finally re-installed the operating system and spent the weekend setting up the laptop. – Harshil Sharma May 7 '18 at 0:07
  • What made you think Wayland was the problem? – WinEunuuchs2Unix May 11 '18 at 22:01
  • @WinEunuuchs2Unix some posts on the Internet. – Harshil Sharma May 12 '18 at 7:44
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    Next time please include a link to the reference you were following so that others can confirm it is relevant to the problem at hand. – WinEunuuchs2Unix May 12 '18 at 14:27
  • @WinEunuuchs2Unix got it. – Harshil Sharma May 13 '18 at 5:40
10

The gnome reconfigure command did not work for me.

What did work was changing fs.inotify.max_user_watches. I used this solution: https://askbot.fedoraproject.org/en/question/115963/gnome-authentication-error-when-logging-in-after-lock/

  • it seems like an update has been provided by Canonical having fs.inotify.max_user_watches=1048576 setting inside the /etc/sysctl.d/99-sysctl.conf file. unfortunately up to date the problem hasn't been solved with this update yet – Oleg Kokorin Jul 4 '18 at 15:19
  • It works like a charm! – Haozhe Xie Sep 13 '18 at 13:17
  • Glad you found this. It has been driving me crazy! – Dashdrum Oct 16 '18 at 19:58
  • Can you inline the steps here? the page ask.fedoraproject.org/en/question/115963/… is not found. i installed 18.10 fresh today. – tgkprog May 11 at 10:52
  • from medium.com/@at15/… edit /etc/sysctl.conf to add/ edit the line: fs.inotify.max_user_watches=524288 – tgkprog May 11 at 10:56
4

I had the same problem. After running the following I can re-login from the lock screen.

sudo dpkg-reconfigure gnome-shell
  • I ultimately re-installed Ubuntu 18.04 to get rid of the issue. – Harshil Sharma May 12 '18 at 7:45
  • I came across my solution because you re-installed. I was looking for other ways than a full re-install. I thought I might re-install Gnome only since Gnome handles the login screen now. And a comment on a post (some other Gnome weirdness from a while ago) about re-installing Gnome was a suggestion to use dpkg to reconfigure. So I tried that, and my lock screen issue went away. – Philip Weiss May 12 '18 at 22:47
  • not worked for me – Ankur Loriya Mar 8 at 12:36
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    works like a charm – V.Y. Mar 27 at 7:54
2

I experienced the same issue and by heading into a new terminal (Ctrl+Alt+F3) I ran sudo service gdm restart which switched back to a graphical login. Logging in didn't work and the warning on the terminal said a warning about not being able to watch the file system, not enough disk space. The fix was increasing the max_user_watches as found in this article.

  • Yes it is worked for me... thank you for the solution. – Ankur Loriya Mar 8 at 12:36
1

The gnome reconfigure command worked for me even after a completely clean reinstall failed. I had also tried to use the wayland log in and got stuck in a log in loop and had also tried to purge upstart which was apparently causing issues for some users.

1

In order to resolve this issue open /etc/sysctl.conf file as root user in your favourite text edior. Now add fs.inotify.max_user_watches = 524288 at the bottom of the file and save it. Run sudo sysctl -p command in terminal to persist the changes you made in sysctl. And its done !

0

I had similar issue. I ran the following to ensure all my packages were up to date

  1. sudo apt update & apt upgrade

The above displayed a message "6 packages to upgrade" I then ran the following to do an upgrade.

  1. sudo apt full-upgrade

Then reboot my desktop.

  1. sudo reboot

After reboot, the login screen should allow you to enter the password.

0

In my case, gnome wasn't proper. my error was dpkg: unrecoverable fatal error, aborting: unknown group 'geoclue' in statoverride file

So I had to go to statoverride and groupadd geoclue But still whatever files were there in statoverride file they were showing the same error, I had to groupadd all the groups, then sudo apt-get install --reinstall gnome-session ubuntu-desktop that's it. Took me almost whole day but it did work.

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