sudo apt-get upgrade

aamir@aamir-pc:~$ sudo apt-get upgrade

Reading package lists... Done

Building dependency tree      

Reading state information... Done

You might want to run 'apt-get -f install' to correct these.

The following packages have unmet dependencies:

 network-manager-openvpn : Depends: libnm-glib2 (>= 0.8~a~git.20090917t210753.fdb5ef2) but it is not installable

 network-manager-openvpn-gnome : Depends: libnm-glib2 (>= 0.8~a~git.20090917t210753.fdb5ef2) but it is not installable

E: Unmet dependencies. Try using -f.

aamir@aamir-pc:~$