For years, many Ubuntu users have felt that traditional .deb packages were being gradually sidelined in favor of the Snap ecosystem.
It started quietly. Double-clicking a downloaded .deb file would open it in Archive Manager instead of the installer. Then came controversial changes. Apps like Chromium, Thunderbolt and Firefox began defaulting to Snap packages, even when users tried installing them via the apt command in the terminal.
It continued further as Ubuntu introduced its new Snap Store. In Ubuntu 24.04, it ignored .deb packages completely. Double-clicking a .deb file would open the App Center, but wouldn’t actually install the package and just hang there. That behavior was later reverted after I highlighted it through It’s FOSS.
If I’m not wrong the default shortcut to cycle between app’s windows is Alt + the_key_above_tab.
Currently I’m not in front of my computer, afterwards I’ll check shortcut name and tell you.
Edit:
Inside Settings > Keyboard > Customize Shortcuts, there are: