My sincere thanks to those who responded to my queries for install assistance on a Lombard powerbook. I have finally determined the source of the problem: a bad DIMM. !!! On the up side, I am now very familiar with current linux library organization and the Debian package management software. 8-)
With the offending DIMM removed, I've got Debian running with Paul Mackerras' latest. I even got X running, altho the performance is slow at present. Moving forward now, John