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aptshows me two packages existing forgufw. Typinggufwin terminal opens the older version 12.10. What do you think?apt-cache policy gufwand perhaps for completenessdpkg -l gufw?apt -t unstable install gufw?unstableversions, at your peril) or see if it can somehow be made to work with dependencies ignored. (You probably have older versions of these packages; if you are lucky, they could just happen to work.)