How to find out your Ubuntu's release codename or version
So you want to know if you are on natty, precise, quantal, or something else? Check /etc/lsb-release.
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.2 LTS"
Or, use the lsb_release command:
$ lsb_release -cd
Description: Ubuntu 14.04.1 LTS
Codename: trusty
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