This issue is fixed with the new thunderbird update (1:60.0+build4-0ubuntu0.18.04.4) in Ubuntu Mozilla Security Team PPA.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1792707 Title: Thunderbird version 60.0 language packs do not work - Ubuntu Mozilla Security Team PPA Status in thunderbird package in Ubuntu: Confirmed Bug description: Steps to reproduce: Hi install Thundebird 60 in Ubuntu 16.04 sudo apt-get install thunderbird-locale-pt-br and app show in en-US set manual in config editor general.useragent.locale pt-BR not work Actual results: Thundebird 60 show in en-US Expected results: Thundebird 60 show in pt-BR To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1792707/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp