you must remove both deb packages and snaps otherwise it will cause issues before upgrade do this :
sudo apt purge firefox firefox-* sudo snap remove firefox upgrade to 24.04 after upgrade add this mozilla respository https://launchpad.net/~mozillateam/+archive/ubuntu/ppa sudo apt install firefox firefox-locale-en this should bypass snap instalation and allow you to upgrade -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2043820 Title: Unable to contact snap store on Xubuntu from Jammy to Noble To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2043820/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs