Binary installation problems (GRC failed) in Ubuntu9.04

Hi all,
I was trying to install GNU radio 3.2 in Ubuntu9.04. I followed the
installation instructions :
I did update the source list which includes these two sources:

deb stable main

deb-src stable main

However, after updating, and proceed to install GNU/GRC, I found the
message: “E:could not find the package : gnuradio-companion”. I also
to installed these two guys separately, and gnuradio could be installed
while GRC still has the same error. Does anyone have any ideas about
problem? Please help me. Thanks in advance!