> So I should download the corresponding files from launchpad to a new
directory and then issue the sudo dpkg -i *.deb command from there to
replace the updated files on my system, correct?

Yes


> Should there be anything else I ought to do before issuing the sudo dpkg 
> command? Should I take any action to ensure I don't accidentally "update" 
> these files and get back into the same situation? 

there are way to 'pin' updates with apt or synaptic but at this point we
are trying to confirm if that update is the issue, if it is and that you
want to pin back to the old version we can help you with that


> How helpful to you would it be for me to install the .ddeb file and which of 
> the traces would you want me to run again? Would I do the install via sudo 
> dpkg -i or use synaptic or apt in some manner?

it would provide more details on the segfault and make it easier to
understand, but let's start by going back to the previous gtk3 version
and see if that helps.

There has been no other report of such issue and trying in a fresh VM
from focal gtk3 softwares work fine with the updated gtk, including
gimp, pidgin and others. Unsure if Mint is adding some sort of custom
hacks on top of what is in Ubuntu which would have an impact or if that
could be something local.

One other thing you could try is to create a new local user, log with it
and see if the issue is still there, it would tell us if it's due to
some user profile configuration or something wrong in the system

-- 
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gtk+2.0 in Ubuntu.
https://bugs.launchpad.net/bugs/1962807

Title:
  segfault in libgtk-x11-2.0.so.0 with several programs

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