Unfortunately running "find ~/.thunderbird -name langpack*@thunderbird.mozilla.org.xpi -exec rm {} \;" didn't fix it for me. From before running that command, I had just the en-GB language pack:
~$ find ~/.thunderbird -name langpack*@thunderbird.mozilla.org.xpi /home/alistair/.thunderbird/gh0m9rq4.default/extensions/langpack-en...@thunderbird.mozilla.org.xpi and had the following thunderbird packages installed: # dpkg -l | grep thunderbird ii thunderbird 1:78.3.2+build1-0ubuntu1 amd64 Email, RSS and newsgroup client with integrated spam filter ii thunderbird-gnome-support 1:78.3.2+build1-0ubuntu1 amd64 Email, RSS and newsgroup client - GNOME support ii thunderbird-locale-en 1:78.3.2+build1-0ubuntu1 amd64 English language pack for Thunderbird ii thunderbird-locale-en-gb 1:78.3.2+build1-0ubuntu1 all Transitional English language pack for Thunderbird ii thunderbird-locale-en-us 1:78.3.2+build1-0ubuntu1 all Transitional English language pack for Thunderbird As with others, running thunderbird in safe mode works for me. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1901829 Title: thunderbird fails to open, xml parse error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1901829/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs