I need some more information to find out how to fix this problem. Run
the following commands in a terminal window, also with the printer
connected and turned on:

sudo modprobe usblp
lsmod | grep usb
sudo usb_printerid /dev/usb/lp0
sudo usb_printerid /dev/usb/lp1

Post all the output here. Run also these commands

sudo usb_printerid /dev/usb/lp0 > id0.txt
sudo usb_printerid /dev/usb/lp1 > id1.txt

and attach the two files to this bug report. Do not compress or package
together these two files.

After that run the command

sudo rmmod usblp

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https://bugs.launchpad.net/bugs/910272

Title:
  CUPS reports printer not connected

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