it is very hard for finding the repo for old cinelera like this. i check some of them is empty. but there’s some site still provided.
i just record one of them. but since the cinelerra is need too many dependencies, and hard to find it, i failed when building the cinelera.

but here are the steps i did for installing it.
just add this line to /etc/apt/sources.list
deb http://www.kiberpipa.org/~gandalf/ubuntu/dapper/mjpegtools ./
deb http://www.kiberpipa.org/~gandalf/ubuntu/dapper/cinelerra/athlonxp/ ./
deb http://giss.tv/~vale/ubuntu32 ./
deb-src http://giss.tv/~vale/ubuntu32 ./

then apt-get install cinellera or using the synaptic

complete the devel needed for cinelerra

finally the ubuntu site said that it need some kernel hack to increase the memory.
edit the /etc/sysctl.conf
add this line at the bottom
kernel/shmmax=0x7fffffff

restart your computer.
and try it