Yeah, I know someone else having problems with the iLamp and MintPPC 11 too, right este el paz ? I only I could get such a machine myself, I could be able to understand the problems.
If you ever reinstall MintPPC 11, can you post the complete log file which resides in /var/log/syslog ? Just get to a shell and try to get that file out somehow. Then we have a clue what's going on with this weird fault @ software installation stage. My guess is that you need to choose another Debian server as there lies the culprit of the problem to my honest opinion.
From the installation instructions:
Be careful which Debian mirror you chose. Some mirrors fail to install all the required software. In the USA the MSU mirror works well and In The Netherlands, ftp.nl.debian.org has it all. You will have to find this out for yourself in other countries.