There seems to be an error during installation. You might try to look at the state of the package managment system from X-Terminal application. Code: sudo gainroot dpkg --configure -a apt-get install -f
sudo gainroot dpkg --configure -a apt-get install -f
If this does not change anything package-wise, i would suggest to remove backupmenu and install it freshly with some update as well. Try Code: sudo gainroot apt-get purge backupmenu apt-get update apt-get upgrade apt-get install backupmenu apt-get install -f
sudo gainroot apt-get purge backupmenu apt-get update apt-get upgrade apt-get install backupmenu apt-get install -f