Can't upgrade to 10.10 from 10.04

[Shellbak3]

I've tried to upgrade from 10.04 to 10.10 several times using a couple of servers but after the tool downloads get an authentication error that the server might not be available or that a network problem might exist. I have no network problems and have tried two servers so it's something else. I've looked around for solutions and found one:

"Updating (libreadline6) didn't help, but building it manually (md5: a3a5bf025a1b8df869f45f34098ffc6a rather than 2569b5ed629a3e573b0a8f9ec23a37ff) and copying my version to /usr/local/lib/libreadline.so.6 worked!"

Is this the only solution? If so, I need detailed directions.

Thanks
Nate