The printer is a HP Deskjet 520. I have managed to get the printer running again by reinstalling the prior kernel-image, namely kernel-image-2.6.8-2-686_286-16_i386.deb and then removing and reinstalling the foomatics packages, e.g. foomatic-db, foomatic-db-engine, etc. On the laptop, "localhost:631" (CUPS) still generated an erroneous description of the printer as "Device URI
arallel:/dev/unknown-parallel0", but after I changed the description in /etc/cups/printers.conf to: "/dev/lp0", I got the printer to operate. I still have a few strange things happening, but at least the printer is running again.