I just tried to install ingen on Ubuntu 12.04 amd64. It fails with the "lv2" package missing. Indeed, there is no lv2 package for ubuntu 12.04. Of course I have lv2core and pretty much everything related but that doesn't seem to help. Did anybody install ingen on Ubuntu recently?
Update: I succeeded. I edited wscript, substituting the dependency on lv2 to lv2core. This made waf configure pass.
Then, waf was failing on the absence of lv2/lv2plug.in/ns/ext/atom/forge.h.
This file was nowhere to be found on my system, so I checked out lv2 from SVN and linked its lv2 subdirectory to the drobillad build directory, so that lv2/lv2plug.in/ns/ext/atom/forge.h was present when I ran waf.
After this, the build completed without errors. Now to see how to connect my alsa midi port of my keyboard with the jack midi port of ingen, to be able to play, but there is a thread about that already... :-)