Ubuntu: Update available message after installing update

After upgrading to 13.04 I get the following message every time I log in:

Welcome to Ubuntu 13.04 (GNU/Linux 3.8.0-22-generic i686)

 * Documentation: https://help.ubuntu.com/

New release '13.04' available.
Run 'do-release-upgrade' to upgrade to it.

Work Around:
# cd /var/lib/ubuntu-release-upgrader/ 
# mv release-upgrade-available release-upgrade-available.old 
# cd /usr/lib/ubuntu-release-upgrader/ 
# ./check-new-release
Logout