Bug#513739: /var/cache/pbuilder not empty so not removed upon purge

[Junichi Uekawa]

At Tue, 03 Feb 2009 02:57:55 +0800,
jidanni at jidanni.org wrote:
> 
> >> dpkg - warning: while removing pbuilder, directory `/var/cache/pbuilder' not empty so not remo
> JU> BTW, cannot reproduce in the case of installing / purging.
> JU> You need to have done something before this happens, right ?
> # aptitude install pbuilder
> # pbuilder create
> ^C
> # aptitude purge pbuilder
> 
> If you don't want to remove user data, then perhaps print a message
> about it when detected. Otherwise it just looks like an unexpected
> error.

Don't be silly, it's a dpkg message.
You want to fix dpkg.