Re: Very unstable wifi connection after upgrade to 12.04 (Intel Ultimate-N 6300)
Have you set IPv6 to 'Ignore' in Network Manager? Please see attached.
I'm not sure I have any further suggestions aside from looking around in the router to see if there are any unusual settings that you might disable. Since we know the iwlwifi driver doesn't work well with 802.11N, I might set the router to use B and G only and see if it helps.
"Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.