During installation, BUM install a bum.desktop file which runs gksudo bum. You should not run just 'bum' from the terminal and your screenshot informs the user that bum requires root privilegies. You should run "sudo bum" from the terminal, as the documentation says. This is not a bug.
- Bug#358716: bum: BUM does not use gksu Fabio Marzocca
- Bug#358716: bum: BUM does not use gksu Luis Matos