Okay looks like DNS isn't working.
Have you tried first rebooting your router ?
and if that makes no difference, manually setting your DNS servers in network-manager ?
Try these settings:-
from here
https://forum.peppermintos.com/index.php/topic,2027.msg19758.html#msg19758 (https://forum.peppermintos.com/index.php/topic,2027.msg19758.html#msg19758)
(http://i.imgur.com/U693yqX.png)