How to check your Ubuntu Version
If you want to check your Ubuntu or Linux Mint version, you can open up a terminal and type the command:
You'll see some output like the following:
me@Achieve ~ $ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 18 Sarah
You can see from the above output that I am using Linux Mint and it shows that I am using Linux Mint 18.