Reinstalled current libmutter.
With dual monitor horizontal aside this gives 
Feb  1 22:26:58 Gert2 gnome-shell[1038]: Failed to allocate texture: Failed to 
create texture 2d due to size/format constraints
Feb  1 22:26:58 Gert2 gnome-shell[1038]: CoglError set over the top of a 
previous CoglError or uninitialized memory.#012This indicates a bug in 
someone's code. You must ensure an error is NULL before it's set.#012The 
overwriting error message was: Sliced texture size of 2560 x 1024 not possible 
with max waste set to -1

Logon-session crashes before showing logon-screen.

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]

Problem is solved by proposed package. No new other problems detected.

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https://bugs.launchpad.net/bugs/1790525

Title:
  gnome-shell assert failure: double free or corruption (fasttop) in
  g_free() from g_error_free() from cogl_error_free() from
  cogl_texture_new_with_size() from
  clutter_offscreen_effect_real_create_texture()

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