Solved: nameservers reset after reboot ,

How to set nameservers in ubuntu 14.04 using resolve conf

http://askubuntu.com/questions/130452/how-do-i-add-a-dns-server-via-resolv-conf

 

http://unix.stackexchange.com/questions/128220/how-do-i-set-my-dns-on-ubuntu-14-04