I have upgraded from 8.04 to 9.04 with fresh installation as I
always do. When I tried 8.10 I had the same problem as I'm now having.
The lp port is missing, usb printing works with no problem. Now, on my
other system running 9.04 and only a parallel port printer I have no
problems but on the system I use everyday the lp port is missing.

The HP Laserjet 6P was there when I first installed and setup my
printers with lp port but it would not print than when I deleted that
printer instance the lp port was no longer there.

In dmesg I get (relevant parts included)

[ 19.099699] usblp0: USB Bidirectional printer dev 2 if 1 alt 0 proto
2 vid 0x03F0 pid 0x3D11
[ 19.099746] usbcore: registered new interface driver usblp
[ 19.466384] parport_pc 00:09: reported by Plug and Play ACPI
[ 19.466469] parport0: PC-style at 0x378 (0x778), irq 7, dma 3
[PCSPP,TRISTATE,COMPAT,ECP,DMA]
[ 19.487946] parport0: Printer, Hewlett-Packard HP LaserJet 6P
[ 25.599820] ppdev0: claim the port first
[ 25.599907] ppdev0: registered pardevice
[ 37.101151] parport0: no more devices allowed
[ 37.101160] lp: driver loaded but no devices found
[ 40.006101] parport0: no more devices allowed
[ 40.006105] ppdev0: failed to register device!
[ 102.291419] parport0: no more devices allowed
[ 102.291423] ppdev0: failed to register device!
[ 102.562387] parport0: no more devices allowed
[ 102.562392] ppdev0: failed to register device!


I have searched the ubuntuforums, cups lists, as well as google with no
help.
I even searched through the messages on this list.
I really hate to revert back to 8.04 again because of this stupid
parallel port problem.