You were right, I installed the l10n package from Debian and it worked. I apologize for not seeing that the problem was caused by the language pack and lightning not working together.
tis 2020-01-07 klockan 22:21 +0100 skrev Carsten Schoenert: > Am 07.01.20 um 22:18 schrieb Jonatan Nyberg: > > Hello, > > I just know that thunderbird works without lighning installed. I > > hope > > someone will get this bug fixed. > > Well, as written, what about just using the l10n packages from > Debian. > I can use them without problems. So once again, it's not a Debian > issue, > the packages from the archive are working together. >