With the change that now the first (invalid) entry is " [fi-fi]". The second is the correct "suomi [fi]", so still it's that removing the first entry makes everything work as intended, but by default it falls back incorrectly to English.
** Description changed: It would seem something caused an incorrect language setting in Firefox, potentially due to 14.04 LTS -> 16.04 LTS upgrade. Update August 2016: happens also on a clean Ubuntu 16.04.1 installation. + Update August 2017: also on clean 16.04.3. --- - - I noticed I'm getting redirected to English pages on help.ubuntu.com, even though that hasn't happened before like eg within the last month. I upgraded this machine to xenial today. + I noticed I'm getting redirected to English pages on help.ubuntu.com, + even though that hasn't happened before like eg within the last month. I + upgraded this machine to xenial today. When looking at it more (after filing this bug originally against documentation) in Firefox settings -> Content -> Languages, I noticed the top-most item was "empty" (no language name) with [fi-fi] in brackets. Beneath it was suomi [fi] and english options. When I removed the "empty" language from the list, help.ubuntu.com started behaving correctly again. At this point I don't have better information but leaving the bug open to be documented. Original report: All links at eg https://help.ubuntu.com/16.04/ubuntu-help/index.html.fi point unfortunately to English versions of the pages, like https://help.ubuntu.com/16.04/ubuntu-help/unity-introduction.html The correct links would have the ".fi" added to the URL, like https://help.ubuntu.com/16.04/ubuntu-help/unity-introduction.html.fi ** Summary changed: - Firefox has non-functional preferred language after upgrade + Firefox has non-functional preferred language both after upgrade and clean install -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574638 Title: Firefox has non-functional preferred language both after upgrade and clean install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1574638/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs