Reinstalled current libmutter.
With dual monitor horizontal aside this problem could not be reproduced because
logon-session crashes before showing logon-screen, (caused by bug #1790525).
Installed proposed version:
apt list libmutter-3-0
Listing... Done
libmutter-3-0/cosmic-proposed,now 3.30.2-1~ubuntu18.10.3 i386 [installed]
No crash anymore when trying to suspend at logon-screen.
Problem is solved by proposed package. No new other problems detected.
Reinstalled current libmutter.
With dual monitor horizontal aside this problem could not be reproduced because
logon-session crashes before showing logon-screen, (caused by bug #1790525).
Installed proposed version:
apt list libmutter-3-0 3-0/cosmic- proposed, now 3.30.2- 1~ubuntu18. 10.3 i386 [installed]
Listing... Done
libmutter-
No crash anymore when trying to suspend at logon-screen.
Problem is solved by proposed package. No new other problems detected.