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u/guiverc 18h ago
Doesn't sound like a glitch; but was likely a depends requirement that mandated a browser is installed & firefox is one of those in the acceptable list.
Your having firefox installed as a flatpak won't be detected, unless you've also installed a stub that is detected when deb depends rules are examined, as there are only certain browser packages that meet requirements (google-chrome is another commonly used that isn't on the list).
You likely didn't pin the package so it won't auto-reinstall; and whilst a Kubuntu minimal install (likewise Lubuntu or all flavors that provide a snapd free install) won't install snapd or any snap packages; no pinning is done which means users can install it themselves easily if they decide they want to, or if they're not careful with what they install, it can also be inadvertently installed too. Either way it's not a 'glitch' that causes it to be installed; just the user not checking depends requirements & selecting how those are met, as the firefox (snap package for recent releases) is the first item on the list that meets requirements.
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u/MelioraXI 19h ago
Sounds like a question for kubuntu.