Quelle((http://www.howtogeek.com/howto/ubuntu/how-to-tell-what-version-of-ubuntu-you-are-running/))

====== How to Tell What Version of Ubuntu You Are Running ======

Telling what version of Ubuntu you are running is extremely easy. You would commonly use this command to figure out if you are running Edgy after you upgraded from Dapper
.
<code>cat /etc/issue
Ubuntu edgy (development branch)</code>

Note that the version numbers might change over time. I’m running the beta version so that’s what shows up when I run that command. Either way, it should be clear that you are running Edgy.

You can get the version on Debian (also on Ubuntu of course) with: cat /etc/version