Downloading the ubuntu-restricted-extras package itself wont help you much. It is actually a "meta-package", ie, a package with no "real" content, but with a list of dependencies. Thats why its size is so small.

When you try to install it, it checks the dependencies and downloads and installs them. And those are a few tens of megabytes.

So, if you want a complete offline install, i suggest this:

• Go to any computer with internet, and use a Live CD/USB Ubuntu session. (so you have a clean OS with no extra package installed)




• Open Synaptics (Administration -> Package Manager), use the Quick Search for ubuntu-restricted-extras




• In the list, double-click it. On the dialog window, click Mark.

• Click Apply.




• It will show a window of all the packages that must be installed. Those are the ones you need to download and install in your offline machine.

• Either download them manually, or check the "Download Package Files Only" checkbox. The DEBs will be downloaded to /var/cache/apt/archives




• You can also use File -> Generate Package download script option. Create a folder for the script, save it, then run it. All DEBs will be downloaded to that folder. Copy the whole folder to a USB/DVD, then use File -> Add downloaded packages option in the offline computer.

And, VERY important: both the offline and online computers must have the SAME architecture. (meaning 32/64 bits, OS, etc). So the package downloaded in one will be the correct one for the other.