Which Ubuntu version is installed?

If you are just interessted in the Ubuntu version then type lsb_release -a gives you an output like this: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.2 LTS Release: 10.04 Codename: lucid If you like to now the kernel version then type uname -a Linux myhostname 2.6.32-29-generic #58-Ubuntu \ SMP Fri Feb 11 19:00:09 UTC 2011 i686 GNU/Linux