I am also having the same problem.
Inspecting the crash files revealed that the real issue is the following.
https://bugs.launchpad.net/ubuntu/+source/gnome-clocks/+bug/1873077
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I find the following links related to gnome-clocks:
1. https://errors.ubuntu.com/oops/67861316-8540-11ea-99bc-fa163e102db1
2. https://errors.ubuntu.com/oops/7133d4c0-8973-11ea-ac5e-fa163e983629
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The Id is:
e1b093dc9dc97953eddd0a8757c88557282a5a55850ae36fa941c8bab401d5c5408146d9924c9361d4243aa155b683c6b985a1a351f472f973ba38806ba4babb
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https://bugs.launchpad.net/bugs/1874405
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:
1. Look in /var/crash for crash files and if found run:
ubuntu-bug YOURFILE.crash
Then tell
I wonder why it is indeed looking for a file with a theme name like
`/org/gnome/clocks/css/gnome-clocks.adwaita.css`. Indeed the package
contains `/org/gnome/clocks/css/gnome-clocks.css` and such file is also
listed as a gresource..
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I googled similar errors and I found out that this is just a warning, and
likely not the cause of the segmentation fault.
An example here of a functioning gnome-clocks with the same warning:
https://forum.manjaro.org/t/gnome-calendar-and-clocks-doesnt-work-after-3-36-upgrade/131394/12
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Note that the error message mentions different .css-files depending on
the desktop environment or theme you are running.
** Tags added: groovy
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https://bugs.launchpad.net/bugs/1874405
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-clocks (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1874405