Thank you for your bug report. Do you have the snap-store snap installed? The default handled is snap-store_ubuntu-software-local- file.desktop which is provide by it
what's the output of $ gio mime application/x-debian-package ** Changed in: nautilus (Ubuntu) Importance: Undecided => Low ** Changed in: nautilus (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1969151 Title: Files does not open DEB packages installer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1969151/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs