Answer for Every time I run apt-get upgrade or apt-get dist-upgrade airvpn gets removed by default and I need to reinstall it every time. Can this be avoided ?

$: apt-get dist-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:
 airvpn : Depends: libmono-system-runtime2.0-cil but it is not installable
          Depends: libmono-winforms2.0-cil but it is not installable
          Depends: libmono-corlib2.0-cil but it is not installable
E: Unmet dependencies. Try using -f.