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Paddy Landau
Asked: 2016-08-28 06:11:23 +0800 CST

Lubuntu rejects password when resuming from automatic suspend

  • 772

History

  • I have Ubuntu. Because of its extraordinarily slow speed (especially after upgrading to 16.04 from 14.04, almost as slow as Windows), I installed lubuntu-desktop and now use Lubuntu. The change has greatly speeded my computer.
  • I am able to choose whether to boot into Ubuntu or Lubuntu each time I log in.
  • After this change, in Lubuntu, the automatic suspend would not work because it asked for the password. I fixed this using the solution to Authentication required before suspend.

Problem

When I resume from automatic suspend, I am greeted with an unusual login screen, which has only three elements:

  • The day and time
  • The title "Light Display Manager"
  • A prompt to enter a password without a user being displayed

When I enter my password, the prompt responds with, "Incorrect password". I have, of course, tried multiple times and typed my password carefully.

I cannot proceed from that screen, and even Ctrl+Alt+Delete doesn't work. I have to use REISUB. EDIT: I can also sign into a console (Ctrl+Alt+F1) and sudo reboot.

Extra notes

If I suspend manually, or if I use Ubuntu, the computer resumes properly with the correct login screen, accepting my password and allowing me to continue. Only the automatic suspend from Lubuntu gives this problem.

Question

How do I get the computer to resume correctly from automatic suspend when using Lubuntu?

16.04

4 Answers

  1. Had similar problem. After a reboot, the screensaver password screen keeps asking for my password. Entering my password just keeps me going back to the same screensame password screen. Went to TTY and by sheer luck, i saw the out of space notice when I tried to uninstall light-locker. Turns out I had no more free space on my hdd.

    • 1

  2. For a quick temporary fix:

    • Login to a terminal, use CTRL+ALT+F1 or ...+F2 etc.

    • Kill light-locker as admin: sudo pkill light-locker

    • 0

  3. This solved my problem

    sudo apt remove gnome-screensaver

    There is a conflict between screensavers as LightDM starts up gnome-screensaver when the device goes into suspend at the lock/login screen.

    • 0

  4. Edit /etc/lightdm/users.conf as administrator. In the [UserList] section, make sure you have

    hidden-users=nobody nobody4 noaccess lightdm

    (user lightdm is often missing)

    • -1