How to find a file inside a package?!

Fri Nov 10 11:56:02 UTC 2006

On Fri, 2006-11-10 at 18:31 +0700, Ali Milis wrote:
> Is there anyway to find  the package of a filename THAT IS NOT
> installed? A couple of days ago, I was looking for "lockfile".
> Fortunately, I recall that "procmail" provides "lockfile".
> 
> But what if I totally forgot? Is there anyway to find it? 

Either use http://packages.ubuntu.com/ and scroll down to "Search the
contents of packages", or use apt-file and see
http://www.debian.org/doc/manuals/apt-howto/ch-search.en.html#s-apt-file