I upgraded from ubuntu 18.04 to 19.04 recently.
By default, only official PPAs were enabled so I removed all other PPAs from "Other Software" tab of "Softwares & Updates"
But all the apps/packages still present. That means probably I won't be able to get community updates now.
Is there any mass uninstaller, to uninstall all apps without any PPA listed or just a gui mass uninstaller to remove 3rd party packages.