After upgrading from 17.10 to 18.04 I can't open a terminal by any method.
After reinstalling and updating the problem is still unsolved.
What can I do to fix this?
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This fix seemed to work for me. But did not survive a reboot.
When running localectl some entries showed as "n/a" - this seems to be key.
Any command-line activity can be run in xterm (Alt-F2, xterm).
Actual fix (for me):
(Credits to this thread: https://bbs.archlinux.org/viewtopic.php?id=180103)
So I came across the same issue and no language settings seemed to help. Turnout the issue was with my PPA. I had recently upgraded my python3 to 3.7.5 from 3.6. This would have been fine but then I make my default python3 to be 3.7 which made some issues. So the solution to this is: Run this command
sudo gedit /usr/bin/gnome-terminal
and than change #! /usr/bin/python3 to #! /usr/bin/python3.6 This seems to solve my isuue. Thanks!