Right click on many kinds of files such as tar.bz2, ogg-vorbis etc. and the context menu always shows Libreoffice calc. The software to handle these files is installed and appears in open with context menu.
Operating System: Ubuntu 20.04 KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8 Kernel Version: 5.13.0-28-generic OS Type: 64-bit
I reinstalled Kubuntu from scratch on reformatted partitions and the weird problem is gone. Not that surprising really. Kubuntu installer crashed and system became unbootable when I tried to do it without formatting, which I read should work sometimes and preserve user data/some software. I ended up creating a separate /home partition so this kind stuff might be a little easier in the future.
Ok, I have found the solution. System Settings, go to File Associations, expand application and click on x-bzip-compressed-tar and then update applications or sort them by your priorities.
In my case it opened also any plain text file like sha512, so I had to update different type, but the principle is still the same.
