Comment 3 for bug 130289

This is a bit of a stack in the dark, but could you please try:

=== modified file 'apt-pkg/acquire-worker.cc'
--- apt-pkg/acquire-worker.cc 2009-07-21 14:05:52 +0000
+++ apt-pkg/acquire-worker.cc 2010-03-25 14:05:09 +0000
@@ -464,7 +464,7 @@
    {
       if (Top->Value.empty() == false)
       {
- string Line = "Config-Item: " + QuoteString(Top->FullTag(),"=\"\n") + "=";
+ string Line = "Config-Item: " + QuoteString(Top->FullTag(),"%=\"\n") + "=";
   Line += QuoteString(Top->Value,"\n") + '\n';
   Message += Line;
       }

and see if that helps?