Your "lsusb" output does not show any printer. This looks like a low-
level USB problem (kernel).
Are you able to print on your Brother printer?
Can you also post the /usr/lib/cups/filter/pstocanonbj script?
** Changed in: cups (Ubuntu)
Status: New => Incomplete
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[Jaunty] Canon Pixus 550i stopped working a few days ago
https://bugs.launchpad.net/bugs/340298
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