Hi Steve, Yeah, it is due to the mirrors going down...
in my experience, I've been able to install about 6 times over, (trying different configs, etc) but yesterday, I could not install at all, was getting timeout errors, and connections lost...
Also, I was trying to update 6.10 and was receiving the same errors...
most definately, was an ubuntu repository issue...
I tried again today, and all is (still slow, but) better.
Keep in mind, ubuntu has released fiesty yesterday, so the servers are probably going to be pretty busy for the next few days dealing with that..
Good luck with your install
Dan