After downloading the 0.5.4.1 zip to an Ubuntu 11.04 system.
python setup.py build
building '_jpype' extension
cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++
In file included from src/native/common/jp_invocationhandler.cpp:1:0:
src/native/common/include/jpype.h:45:17: fatal error: jni.h: No such file or directory
error: command 'gcc' failed with exit status 1
However, the Synaptic manager installs correctly, I think.