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This question already has an answer here:

I upgraded to 13.04 shortly after it came out. But this computer still prompts me to upgrade. Example:

Welcome to Ubuntu 13.04 (GNU/Linux 3.8.0-21-generic x86_64)
 * Documentation:
0 packages can be updated.
0 updates are security updates.
New release '13.04' available.
Run 'do-release-upgrade' to upgrade to it.

stephane@acert:~$ sudo do-release-upgrade
[sudo] password for stephane:
Checking for a new Ubuntu release
No new release found
stephane@acert:~$ cat /etc/issue*
Ubuntu 13.04 \n \l

Ubuntu 13.04

Why does it keep telling me about 13.04 and to run do-release-upgrade if I'm already on that version?

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marked as duplicate by Mitch, Kevin Bowen, Basharat Sialvi, Eric Carvalho, coteyr May 21 '13 at 12:22

This question was marked as an exact duplicate of an existing question.

up vote 0 down vote accepted

Here is the solution that worked for me:

sudo rm /var/lib/ubuntu-release-upgrader/release-upgrade-available

Discovered through other questions such as Update available message after installing update and bug report comments such as

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