problem adding a printer on HPUX (10.20 in my case, but this error occurs on all versions)
lpadmin: can't open member file
one possible cause:
/etc/lp needs to be owned by the 'lp' user id.
# ll -d /etc/lp
drwxr-xr-x 8 root bin 1024 May 7 15:54 /etc/lp
chown lp /etc/lp