Atenção usuários de email com anti-spam (Uol e Bol).
echo 'nameserver 8.8.8.8' > resolv.confecho 'nameserver 8.8.4.4' >> resolv.confsudo mv resolv.conf /etc
nameserver 8.8.8.8nameserver 208.67.222.222
Bem, consegui resolver isto desativando o ipv6sudo gedit /etc/default/grubadd ipv6.disable=1 between "" at the GRUB_CMDLINE_LINUX=""run command update-grub