Как узнать версию Ubuntu

cat /etc/*release*
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.3 LTS"
NAME="Ubuntu"
VERSION="12.04.3 LTS, Precise Pangolin"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu precise (12.04.3 LTS)"
VERSION_ID="12.04"

или cat /etc/issue
Ubuntu 12.04.3 LTS \n \l

или lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise