I had problems with Ubuntu updates hanging and the fix was to do something that (I think) caused networking to prefer IPV4. I'm on Comcast but don't know if the

I had problems with Ubuntu updates hanging and the fix was to do something that (I think) caused networking to prefer IPV4. I'm on Comcast but don't know if the problem was theirs. If networking preferred IPV6 prior to the change and only one site gave trouble, I'd be inclined to blame something specific to that site or the route involved.