I use the gnome desktop environment, and whenever I try to open the gnome control center I get an error saying:

[INFO 18:21:22.277197] Application.vala:153: System Settings version: 2.0
[INFO 18:21:22.277282] Application.vala:155: Kernel version: 4.10.0-30-generic
[FATAL 18:21:22.327817] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[FATAL 18:21:22.328979] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[FATAL 18:21:22.329407] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[FATAL 18:21:22.330073] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[FATAL 18:21:22.330846] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[FATAL 18:21:22.331477] [GLib] g_utf8_collate: assertion 'str1 != NULL' failed
[ERROR 18:21:22.460428] [GLib-GIO] Settings schema 'org.pantheon.desktop.gala.animations' is not installed
/usr/bin/gnome-control-center: line 20:  9675 Trace/breakpoint trap   (core dumped) switchboard $switchboard_options $requested_plug

I have tried re installing gnome control center, but it hasn't worked. How do I solve the problem? Thankful for answers.

UPDATE: this is the message from the command cat /etc/default/locale

#  File generated by update-locale
  • Show me the output of cat /etc/default/locale. Is this something that just started to fail for you? Do you have any other account on this system that you can log into and try this? – heynnema Aug 6 '17 at 17:56
  • @heynnema This was the first time this problem occured. I don't have any other account to log into and try this. I have updated my question to show the output of the command. – ALEX Aug 6 '17 at 18:27
  • So if you reboot, does the problem still occur? – heynnema Aug 6 '17 at 18:39
  • @heynnema the problem is still there after I've rebooted – ALEX Aug 6 '17 at 19:07
  • Temporarily disable all GNOME extensions, logout, log in, and see if that makes any difference. – heynnema Aug 6 '17 at 19:15

You probably installed some or all of enlightenment desktop. No guarantees, but try this:

WARNING: This could hose your system.

sudo apt purge enlightenment-desktop
sudo apt autoremove
sudo apt purge gnome-control-center
sudo apt install ubuntu-gnome-desktop
# and maybe
sudo apt install gnome-control-center

..this is the gist of what worked for me. Use at your own risk.

| improve this answer | |
  • Didn't work for me. – Philippe Delteil Mar 28 '18 at 21:51
  • Didn't work for me either :( – Nusry Dec 29 '19 at 5:12

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