Failure of Update Manager

[ted_001]

Dear All,
I am running 12.04. When I started the machine this morning Update Manager told me there were 61 software updates available.
However the update failed. It asked me to check my internet connection, which was fine. It gave me the following message:-

Failed to fetch http://gb.archive.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.8.3p1-1ubuntu3.1_i386.deb 404 Not Found [IP: 194.169.254.10 80]
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/pool/main/z/zenity/zenity_3.4.0-0ubuntu3_i386.deb 404 Not Found [IP: 194.169.254.10 80]
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/pool/main/z/zenity/zenity-common_3.4.0-0ubuntu3_all.deb 404 Not Found [IP: 194.169.254.10 80]

Has anyone else had the same problem?
Best wishes,
Ted Mason

[ted_001]

Dear All,
Update Manager seems to working perfectly now, and all the updates have been downloaded and installed. In fact 96 updates have been installed.
Perhaps somewhere along the line a server was down for maintainance.
I will have more patience in future!
Best wishes,
Ted Mason