@Andrea
Can you try adding the following setting to the NetworkManager connection file for "Canonical-2.4GHz-g" in /etc/NetworkManager/system-connections:
[ipv6] method=ignore
"[ipv6]" should already be there, so just add "method=ignore", and remove any other settings under "ipv6".
Restart the device once you've updated the connection file.
@Andrea
Can you try adding the following setting to the NetworkManager connection file for "Canonical- 2.4GHz- g" in /etc/NetworkMan ager/system- connections:
[ipv6]
method=ignore
"[ipv6]" should already be there, so just add "method=ignore", and remove any other settings under "ipv6".
Restart the device once you've updated the connection file.