Ubuntu 14.04 reached end of standard support in April 2019:
https://wiki.ubuntu.com/Releases
If you would like to continue with free support then please update to a
newer Ubuntu version and tell us if the problem still occurs.
If you would like to continue with Ubuntu 14.04 then there is a
Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 14.04 (trusty) reached end-of-life on April 28, 2017
https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes/UbuntuGNOME#Support
https://lists.ubuntu.com/archives/ubuntu-gnome/2017-March/004211.html
We appreciate that this bug may be old and you
** Summary changed:
- gnome-shell crashed with SIGABRT in g_assertion_message()
+ gnome-shell crashed with SIGABRT in g_assertion_message() from
g_assertion_message_expr() from g_base_info_unref() from boxed_finalize() from
finalize() [girepository/gibaseinfo.c:256]
** Summary changed:
-