update manager

On my laptop (jaunty), there is a particular message which keeps popping up:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty/Release.gpg  Could not
connect to mt.archive.ubuntu.com:80 (194.158.43.55), connection timed out

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty/main/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty/restricted/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty/universe/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty/multiverse/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty-updates/Release.gpg 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty-updates/main/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to
fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty-updates/restricted/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty-updates/universe/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Failed to
fetch
http://mt.archive.ubuntu.com/ubuntu/dists/jaunty-updates/multiverse/i18n/Translation-mt.bz2 
Unable to connect to mt.archive.ubuntu.com http:

W: Some index files failed to download, they have been ignored, or old
ones used instead.

How could I fix this?

Thanks!
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