USB printer ML-1510 'may not be connected'

[pinus]

Description: Ubuntu jaunty (development branch) (updated 2009-03-29)
Release: 9.04

If I connect the printer I can see in the log files that it is connected but I can not print.
It says the the printer might not be connected.
I unplugged and plugged it several times, switched the printer off etc. and even rebooted the system.
No printing!

Mar 29 12:21:08 zesi kernel: [ 7996.008017] usb 5-1: new full speed USB device using ohci_hcd and address 4
Mar 29 12:21:08 zesi kernel: [ 7996.177107] usb 5-1: configuration #1 chosen from 1 choice
Mar 29 12:21:08 zesi kernel: [ 7996.184098] usblp0: USB Bidirectional printer dev 4 if 0 alt 0 proto 2 vid 0x04E8 pid 0x3242

debug.log
Mar 29 12:21:08 zesi hal_lpadmin: Running hal_lpadmin
Mar 29 12:21:09 zesi hal_lpadmin: hal_lpadmin triggered by low-level USB device
Mar 29 12:21:09 zesi hal_lpadmin: Getting device ID from the usblp HAL entry ...
Mar 29 12:21:09 zesi hal_lpadmin: Device ID for /dev/usb/lp0: MFG:Samsung;MDL:ML-1510_700;DES:;CMD:GDI;
Mar 29 12:21:09 zesi hal_lpadmin: Written device ID into HAL database entry: MFG:Samsung;MDL:ML-1510_700;DES:;CMD:GDI;
Mar 29 12:21:09 zesi hal_lpadmin: add
Mar 29 12:21:09 zesi hal_lpadmin: Printer reported by HAL: Samsung ML-1510_700 2R21BADW916952V0
Mar 29 12:21:09 zesi hal_lpadmin: Found configured printer: ML-1510_700; URI: usb://Samsung/ML-1510_700?serial=2R21BADW916952V0
Mar 29 12:21:09 zesi hal_lpadmin: Not adding printer: ML-1510_700 already exists