Apparently you uninstalled the apport package? That's what provides ubuntu-bug, and it's installed by default in Xubuntu.
** Package changed: systemd (Ubuntu) => ubuntu ** Changed in: ubuntu Status: In Progress => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1504247 Title: program "ubuntu-bug" missing in /usr/bin --> unable to report bugs Status in Ubuntu: Invalid Bug description: Fresh installed Xubuntu 15.10 beta (64 Bit). - Firefox crashed, so i wanted to open up a bug report - "sudo ubuntu-bug firefox" came up with an error -- i checked against the host --> ubuntu-bug missing . Sorry for the mix up cause of the eventually wrong package. . To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1504247/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp