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For example, I haved install Ubuntu 13.04 beta2 and sudo apt-get update & upgrade, and lsb_release shows:

Distributor ID: Ubuntu
Description:    Ubuntu 13.04
Release:        13.04
Codename:       raring

But can not find beta 2 symbol. Does that mean upgraded to final release?

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Amongst I suspect other places, the MOTD shown when you log in via SSH or similar indicates whether you are on the development branch or not. (This is the file /etc/motd). –  chronitis Apr 21 '13 at 7:54
    
This information appears to be duplicated in the /etc/issue, /etc/os-release and /etc/lsb-release files, from which presumably the output above comes. These come from the package base-files, and the MOTD is generated from this data. If the text development branch no longer appears, you have something pretty close to the final version. –  chronitis Apr 21 '13 at 8:01
    
@chronitis I believe your comment would make a good answer too :-)) –  guntbert May 10 '13 at 21:12

1 Answer 1

Try using this command to show full release info:

cat /etc/*release

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