Check it out on the official page, here!
There are 32-bit and 64-bit binaries, as well as an SVN repository.
I'm running Edgy, and I managed to compile the SVN, so here is a mini-howto for compilation. This is by no means comprehensive, as who knows what -dev packages you might be missing that I've picked up somewhere along the line.
I KNOW it requires:
Nvidia Cg-Toolkit (available HERE)
The automake version is important, as it will spit all sorts of errors if you have an earlier version.
It PROBABLY requires:
I can't actually say it needs that for certain, only that I have it and the INSTALL file says you need OpenGL libs in order to compile.
Okay, so let's grab our required things:
Our maybe required things:
sudo apt-get install subversion libjpeg62-dev build-essential libgtk2.0-dev libxxf86vm-dev x11proto-xf86vidmode-dev automake1.9 libbz2-dev
The SVN code:
sudo apt-get install libglu1-mesa-dev
Aaaand build it!
svn co https://pcsx2.svn.sourceforge.net/svnroot/pcsx2 pcsx2
And hopefully everything should build!
sh build.sh all
EDIT: libbz2-dev is required for the ISO plugins to compile