I've upgraded my ubuntu server to the 13.04 release. Unfortunately during the upgrade process I lost the connection to the server and the server hasn't completed correctly the upgrade to this release.
The problem happened during the upgrade of the installed software and I've fixed the problems related to apt-get upgrade running a shell suggested command to fix the problem and complete the upgrade of the system.
The only problem that seems that I still have is the notification of an available release upgrade to version 13.04 that appear each time I login, but my ubuntu says that's already at 13.04 as in displayed in this screenshot:
How can I fix it? Could I consider the upgraded process completed safely?