I've also observed this behavior on Kubuntu 20.04.
This command appears to fix the issue: sudo apt install $(check-language-support)
Reference: https://unix.stackexchange.com/questions/421066/popup-language-support-is-incomplete-what-packages-does-it-want-to-install
I've also observed this behavior on Kubuntu 20.04.
This command appears to fix the issue: sudo apt install $(check- language- support)
Reference: https:/ /unix.stackexch ange.com/ questions/ 421066/ popup-language- support- is-incomplete- what-packages- does-it- want-to- install