How to check Ubuntu Version that you are running?
To print out the Ubuntu version you are running, you can run either one of the following commands :
1. Run “/etc/issue” :
root@ehowstuff:~# more /etc/issue Ubuntu 11.10 \n \l
2. Run “lsb_release -a” :
root@ehowstuff:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.10 Release: 11.10 Codename: oneiric