Comment 16 for bug 942180

@Fabio
I've always run 32 bit version.

Anyway, I can reproduce it only on a live environment.

The problem seems to be related to ubuntu-defaults-it ppa, in fact I've found a workaround.

Boot from a live usb/cd, open update-manager→Settings..., "other software" tab and uncheck "ubuntu-defaults-it" ppa.
Then just check for new updates (to reload data), no need to install them.

Open a terminal and "ubuntu-bug linux" (e.g) works!