Resolviendo ec615f07-a-62cb3a1a-s-sites.googlegroups.com (ec615f07-a-62cb3a1a-s-sites.googlegroups.com)... falló: Fallo temporal en la resolución del nombre.
yep, like muntdefems already said it looks like a dns error. Question is do you write your posts with said ubuntu? then that's weird because I don't think you can use the internet at all without resolving dns queries.
Anyway, just as a try you could try using the google domain name servers like so:
sudo echo "nameserver 184.108.40.206" > /etc/resolv.conf
Depending on how its configured, Google Chrome may prefer Google's DNS over whatever's set up for the OS.