Thanks for your bug report. Can you try to get a backtrace?
$ gdb thumb
...
(gdb) run
...
Ctrl-C
(gdb) thread apply all bt
** Changed in: gthumb (Ubuntu)
Importance: Untriaged => Medium
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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Does not start
https://launchpad.net/bugs/58171