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How do I cancel printer job queue? CanonBJC-250 will not function because of long queue. cannot find control.
Apparently the print order was pressed several times. Now there is a long list of print orders and the printer will not work.
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This is more of a Ubuntu-related question than a Firefox one. When print jobs are queued up, you should get a printer icon in the notification area (beside your clock by default). Clicking on the printer should allow you options to cancel the print jobs. Give it a try -- I can't guarantee if it works as I haven't got any printers installed in my Ubuntu.