I got an error as well while printing using Arial Bold from OpenOffice 3.11 while using the "HP LaserJet 4 Plus Foomatic/Postscript" driver:
ERROR: invalidfont OFFENDING COMMAND: definefont
STACK:
/Font -dictionary- /OJIXHX+Arial-BoldMTFID66HGSet2
For what it's worth, My LaserJet 4M+ seems to work on the "HP LaserJet 4 Plus pcl3, hpcups 3.9.8"
I got an error as well while printing using Arial Bold from OpenOffice 3.11 while using the "HP LaserJet 4 Plus Foomatic/ Postscript" driver:
ERROR: invalidfont
OFFENDING COMMAND: definefont
STACK:
/Font Arial-BoldMTFID 66HGSet2
-dictionary-
/OJIXHX+
For what it's worth, My LaserJet 4M+ seems to work on the "HP LaserJet 4 Plus pcl3, hpcups 3.9.8"