I reported this bug for Ubuntu 11.04 too (bug #788150). The problem was successfully fixed by the method described by mp 2009-06-11 (#3). I deleted all HTML-files in /var/lib/apt/lists/.
I reported this bug for Ubuntu 11.04 too (bug #788150). apt/lists/ .
The problem was successfully fixed by the method described by mp 2009-06-11 (#3). I deleted all HTML-files in /var/lib/