I have just created my own Personal Package Archive on Launchpad, which contains packages for the newest version of Open Sonic. They already contains polish translation.
Supported architectures: amd64, i386, lpia
Supported systems: Ubuntu (8.04 and higher) and Debian (Lenny and higher)

Here is the link (I think it could be added to download specific distribution section):
https://launchpad.net/~szymonw/+archive/ppa

If you don't know how to install packages from Launchpad, read this:
https://help.launchpad.net/Packaging/PP … ngSoftware

I will update the repository every time the new version appears

Note: As you can see, there aren't also any specific packages and repositories for Debian (because Launchpad doesn't offer that function), but you can safely use one of Ubuntu's. Maybe you also discovered that these packages were built only on Ubuntu 9.04 Jaunty system and I only copied them to other distributions (hardy, intrepid, karmic). I decided to do this, because versions of liballegro and other packages are very similar in all Ubuntu releases. I also tested these packages on the following systems: Hardy (virtual machine), Intrepid (LiveCD), Jaunty (LiveCD) and Lenny (system, which I'm using every day) and they works fine. If you discover any problems with running and installing the game, write to me; maybe in the future releases I will allow Launchpad to build packages for every release of Ubuntu.