You really shouldn't be on 12.04. It's long past its end of life. Please update your operating system.
I know.... But i'm too lazy, and my sistem is working very well.... No time to retune the new system ;). Anyway, no problem, i'm happy to have supported a linux developer .
Thanks for your message!
Apparently, you need to upgrade your OS.
As i stated, think so too. But i suggest you to put ubuntu 14.04 or equivalent as minimum requirement. A generic "linux OS" is a bit confusing ....
