When I try to install or upgrade the firefox locale package on my (otherwise up to date) KDE Neon 6.3 system, this happens: $ sudo pkcon install firefox-locale-de [sudo] password for user: Resolving [=========================] Testing changes [=========================] Finished [=========================] Fatal error: The following packages have unmet dependencies: firefox-locale-de: Hängt ab von: firefox (>= 1:1snap1-0ubuntu5) but 139.0.1~build1 is to be installed I think the above says it all. Possibly the dependency spec for the firefox-locale packages is broken - or the locale package isn't needed any more but the package manager doesn't know about it. The problem is this is not even noticable unless you start "pkcon update" in Konsole - Discover simply says "unmet dependencies" and stops the upgrade, which prevents all other upgrads from happening as well. Solution: Fix firefox-local-de (and possibly other firefox-locale-XX packages). Thank you :-)
neon defaults to using the deb package(s) provided by mozilla rather than the snap package disguised as a deb from ubuntu. people wishing for a snap can install the firefox snap. mozilla provides lang file in the firefox-l10n-* format. so firefox-l10n-de is the package you wish to install
Sorry for reopening, but maybe I wasn't entirely clear: I am not using the "snap" package. I do not even know why this problem occured. I just know that since about a week ago, system upgrades (using Discover) stopped working with an error message about unmet dependancies. And then I started digging and found out it was impossible to upgrade the system because of the conflict with this firefox locale package (which I did not originally install, they must have been pulled in because of my langauge setting when installing KDE Neon originally). So *something* in the repository dependancies changed and this prevented system upgrades. This is what the bug report is about - not about using snap (which I am not, for Firefox at least).