Comment 240 for bug 417757

I kept having issues even after the fix was released until poking into NetworkManager settings for the wireless connection in use
(in my case: /etc/NetworkManager/system-connections/Auto\ godel), and changing all the settings below method=ignore to 'true'. Somehow method=ignore wasn't enough to disable ipv6 lookups.

BEFORE:
[ipv6]
method=ignore
ignore-auto-routes=false
ignore-auto-dns=false
never-default=false

AFTER:
[ipv6]
method=ignore
ignore-auto-routes=true
ignore-auto-dns=true
never-default=true