Thank you for your reply. It's not closing of nautilus that causes the crash.
Steps to reproduce:
1. Open nautilus
2. Connect to a networkshare (e.g. Google Drive, Samba share)
2.1 If it's a samba share, set a bookmark in nautilus
3. Now connect and disconnect the different shares
** Attachment added: "Report from /var/crash from the time around the freeze"
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1900157/+attachment/5424301/+files/_usr_bin_gnome-shell.1000.crash
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Desktop Bugs,
Public bug reported:
I have two local samba shares and my google drive connected to Nautilus. When I
mount or unmount any combination of them the GNOME session randomly freezes and
the xserver restarts and I can continue in Nautilus just like normal.
Terminal output:
(org.gnome.Nautilus:14697):
Public bug reported:
Description:Ubuntu Focal Fossa (development branch)
Release:20.04
gnome-shell:
Installiert: 3.35.91-1ubuntu2
Installationskandidat: 3.35.91-1ubuntu2
Versionstabelle:
*** 3.35.91-1ubuntu2 500
500 http://de.archive.ubuntu.com/ubuntu