Lucid update problems

[Tom H]

> When I run sudo aptitude update in a terminal I now get:
> Hit http://packages.medibuntu.org lucid/free Packages
> Err http://ppa.launchpad.net lucid/main Packages
> 404  Not Found
> Hit http://packages.medibuntu.org lucid/non-free Packages
> Err http://us.archive.ubuntu.com lucid Release.gpg
> Could not connect to us.archive.ubuntu.com:80
> (91.189.88.45). - connect (110: Connection timed out) [IP:
> 91.189.88.45 80]
> 65% [Waiting for headers]
> The update stops here.

It has been slow for me for the last two days but it does not fail.
Are you ctrl-c'ing too quickly?