Firefox updating via Update Manager - things not retrieved?

[David]

Hi folks,

Update Manager prompts me to download packages that update Firefox, but
during the download I get the message that not all packages could be
retrieved, and do I want to continue anyway - each time I have answered
"No" for the time being. This has stayed the case over a few days now
whenever I retry.

Could someone please suggest what I should do?

Thanks,
Dave

The messages I get are:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Some of the packages could not be retrieved from the server(s).
Do you want to continue, ignoring these packages?



W: Failed to fetch
http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-gnome-support_3.6.21+build1+nobinonly-0ubuntu0.10.04.1_i386.deb
  404  Not Found [IP: 91.189.92.167 80]


W: Failed to fetch
http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-branding_3.6.21+build1+nobinonly-0ubuntu0.10.04.1_i386.deb
  404  Not Found [IP: 91.189.92.167 80]


W: Failed to fetch
http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_3.6.21+build1+nobinonly-0ubuntu0.10.04.1_i386.deb
  404  Not Found [IP: 91.189.92.167 80]


W: Failed to fetch
http://security.ubuntu.com/ubuntu/pool/main/x/xulrunner-1.9.2/xulrunner-1.9.2_1.9.2.21+build1+nobinonly-0ubuntu0.10.04.1_i386.deb
  404  Not Found [IP: 91.189.92.167 80]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~