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I had a bug which presented itself in the same way. I looked at
sources.list and found that the lines<br>
<br>
deb <a class="moz-txt-link-freetext" href="http://ftp.gb.debian.org/debian/">http://ftp.gb.debian.org/debian/</a> squeeze main<br>
deb-src <a class="moz-txt-link-freetext" href="http://ftb.gb.debian.org/debian/">http://ftb.gb.debian.org/debian/</a> squeeze main<br>
<br>
were present. I checked the mirrors listed on the Debian website<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.debian.org/mirror/list">http://www.debian.org/mirror/list</a><br>
<br>
and found that the UK mirror was listed as<br>
<br>
<a class="moz-txt-link-freetext" href="http://ftp">http://ftp</a>.<b>uk</b>.debian.org/debian<br>
<br>
under "Great Britain". I changed the addresses in my sources.list and
software-properties-gtk loaded fine from the command line and the
administration gui menu. I had not set these values so I can only
assume that Debian Squeeze installs the wrong UK mirrors currently.<br>
<br>
I hope this helps,<br>
James<br>
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