Started using Linux and StackExchange since Ubuntu 12.04 LTS. Then Upgraded to 14.04 LTS. (with clean install). Then perfectly used Xubuntu 14.04 (by installing
xubuntu-desktop environment) for about 6 months.
Now I am using Trisquel (GNU/Linux) 7.0 LTS.
I recommend visiting the Philosophy of GNU Project
As I've replaced Ubuntu 14.04 LTS with Trisquel 7.0 LTS, Now my question(s) are became off-topic on AskUbuntu. So, I continue to Unix & Linux.
The second reason for my shifting to
U & L is I found
U & L more interesting than
AU is only Ubuntu specific whereas
U & L is a broad concept and in my opinion
U & L deserves generic questions. (I know why SE has
U & L both).