Jan, Thanks for taking an interest.

OK, I am on Ubuntu 9.04 (which does not have this Gparted/printer
problem) with the printer disconnected, so plugged it in. There were
some messages about looking for driver and so on, I cancelled them. Then
ran dmesg and got this:

[ 2862.488044] usb 3-2: new full speed USB device using uhci_hcd and address 2
[ 2862.660648] usb 3-2: configuration #1 chosen from 1 choice
[ 2862.663278] hub 3-2:1.0: USB hub found
[ 2862.666342] hub 3-2:1.0: 2 ports detected
[ 2862.945281] usb 3-2.1: new full speed USB device using uhci_hcd and address 3
[ 2863.083441] usb 3-2.1: configuration #1 chosen from 1 choice
[ 2863.173369] usb 3-2.2: new full speed USB device using uhci_hcd and address 4
[ 2863.310528] usb 3-2.2: configuration #1 chosen from 1 choice
[ 2863.339519] usblp0: USB Bidirectional printer dev 4 if 0 alt 0 proto 2 vid 
0x413C pid 0x5106
[ 2863.339546] usbcore: registered new interface driver usblp
[ 2864.988685] ppdev0: registered pardevice
[ 2865.036260] ppdev0: unregistered pardevice

Then I unplugged the USB cable and rebooted with the Ubuntu Karmic Alpha
4, chose option "Try Ubuntu without any change to your computer", then
plugged in the printer USB cable. Again there were some messages about
looking for driver and so on, I cancelled them. Then ran dmesg and got
this:

[  359.572016] usb 3-2: new full speed USB device using uhci_hcd and address 2
[  359.745096] usb 3-2: configuration #1 chosen from 1 choice
[  359.748090] hub 3-2:1.0: USB hub found
[  359.750060] hub 3-2:1.0: 2 ports detected
[  360.029939] usb 3-2.1: new full speed USB device using uhci_hcd and address 3
[  360.168052] usb 3-2.1: configuration #1 chosen from 1 choice
[  360.249908] usb 3-2.2: new full speed USB device using uhci_hcd and address 4
[  360.387010] usb 3-2.2: configuration #1 chosen from 1 choice
[  360.606947] usblp0: USB Bidirectional printer dev 4 if 0 alt 0 proto 2 vid 
0x413C pid 0x5106
[  360.606974] usbcore: registered new interface driver usblp

Then I went on the System menu I ran Gparted. After a while there was a 
dialogue box saying that "Sorry, the program "system-config-printer.py" closed 
unexpectedly. It was the second time this happened to me, but it does not 
happen every time - i. e. it is not consistently reproducible. One could ask 
why is Gparted looking for a printer. That error message offered me the 
possibility to send a report. I said yes. Here it is the new bug:
https://bugs.launchpad.net/bugs/422180

Then I rebooted again to reproduce the issue once more. This time around
however Gparted froze the PC, and I had to power it off. The cursor
would still move but that was it. At the bottom left of the Gparted
window there was a message "Scanning all devices", and the progress
about was about a third done. It's strange how Gparted seems to be able
to freeze the window manager.

The moral of the story is that Gparted has frozen my PC as part of
running the Karmic install script, and has also frozen my PC if I call
if from the Karmic live CD.

As I said previously, Gparted in Ubuntu 9.04 works fine on my PC.

António

-- 
PC freezes during install caused by Dell A920 printer
https://bugs.launchpad.net/bugs/413949
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