How can I know to which ubuntu package does a specified file (not on my fs) belongs?

[NoOp]

On 03/30/2011 02:02 PM, Nils Kassube wrote:
> Kevin Wilson wrote:
>> I want to know how can I find (with apt-get), to which ubuntu package
>> does a certain file (which **does not** exist on my filesystem)
>> belong.
> 
> AFAIK apt-get doesn't offer that option but you can install the package 
> "apt-file". Then run the command
> 
> sudo apt-file update
> 
> once and after that you can search for individual files with the command
> 
> apt-file search filename

That doesn't seem to work even with installed package files:

$ apt-file search gnome-default-applications.xml
$

That file is provided in the 'capplets-data' package:
 http://packages.ubuntu.com/maverick/all/capplets-data/filelist
[/usr/share/gnome-control-center/default-apps/gnome-default-applications.xml]

So it's a good question & one that I'd like to know as well.

(Alan's method is the one that I normally use but just using:
http://packages.ubuntu.com/
  [Search the contents of packages|packages that contain files named
like this]