It seems the problem is not specific to gthumb.
The segfault happens in iHD_drv_video.so for many programs:
Viber: 
https://askubuntu.com/questions/1287450/viber-executable-crashes-on-ubuntu-20-10
vokoscreenNG: https://github.com/vkohaupt/vokoscreenNG/issues/117
gcompris-qt: - it is how it fail for me

It seems that segfaults happen with free intel-media-va-driver but not
with intel-media-va-driver-non-free. At least in my case gcompris
started working after the replacement.

Please try to replace the free driver like this:
apt install intel-media-va-driver-non-free


** Bug watch added: github.com/vkohaupt/vokoscreenNG/issues #117
   https://github.com/vkohaupt/vokoscreenNG/issues/117

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https://bugs.launchpad.net/bugs/1903569

Title:
  gthumb crashes with Segmentation fault, after upgrade to Ubuntu 20.10

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