Just to prove I read the release notes ....
A change of name for the DEB files !
Previously, if you were lucky enough to have your (DEB Based) distro include FPC 3.0.4 you could use your package manager to install FPC and then pull down one of the SourceForge Lazarus deb files and install them.
However, we now see fpc as being two different beasts, the distro based fpc and the sourceforge fpc-laz. I don't know if its possible to install both (I really hope not!).
In a way, I see this change as a good thing, it now makes very clear choices between using your distro's packages or the (probably more current) SourceForge ones.
If you build Lazarus from source its still fine to use the fpc Ubuntu package repo and probably will be until the Laz developers decide to use a new FPC.
And I need to make some updates to my draft HowTo
http://wiki.freepascal.org/Installing_Lazarus_on_Linux - but thats a good thing !
Davo