Question: Is there an equivalent to the yum "whatprovides" option in apt-get? 

For example on CentOS

```
yum whatprovides /usr/share/gdm/themes/TreeFlower/background.png

```

Tells me 

```
redhat-logos-4.9.99-11.el5.centos.noarch : CentOS-related icons and pictures.
Repo        : base
Matched from:
Filename    : /usr/share/gdm/themes/TreeFlower/background.png

```

Can I get similar functionality on the command line in Ubuntu?

Answer: 
You want the 'apt-file' command.

```
apt-file search /usr/share/gdm/themes/TreeFlower/background.png

```

Before using it, you may need to create or update its database by running:

```
apt-file update

```
`wajig whichpkg /usr/share/gdm/themes/TreeFlower/background.png`

You'll have to install wajig, which is a frontend to a bunch of utilities related to apt. If you use wajig, you can use all of those tools without having to memorize their names.