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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 .
cat /etc/issue Ubuntu edgy (development branch)
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