i've tried again this today after the installation of updates and pushing backspace has the aspected beaviur.
i think that this bug report could be closed ** Changed in: Ubuntu Status: Unconfirmed => Fix Released -- in keyboard Shortcut backspace key don't erase shortcut https://launchpad.net/bugs/59669 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs