Is there a command line to reset printer?
In my browser I see about 15 print jobs - anyway to clear them all or force them to start printing?
Using an HP laser jet pro printer

using Ubuntu 20.x lts

https://wiki.archlinux.org/title/CUPS#CLI_tools

https://www.cups.org/doc/options.html

There are several command line utilities to manage cups.

It is also possible via the cups web interface.

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You don't need to mess about with the CLI. Just point your browser to http://127.0.0.1:631/ and you can use it to control CUPS.

At times my HP printer has stopped and jobs pile up in the queue.
It can be restarted by using the hplip gui or by using the http://127.0.0.1:631 cups interface

You could try lprm.

If you are having trouble getting your cartridge to read properly or are having connectivity issues with your printer, sometimes a hard reset will resolve the problem.

Power down the printer and then unplug the power cord from the printer and the wall.
Wait for a minute, then plug the printer back in.
The printer will reset and turn on. Wait for the cartridges to center, and then try printing again.
If your issue persists, you can also try resetting the printer to the default or factory settings. Most printers include an option to restore the printer to it's default settings in the “Tools” menu of the display. Consult your printer’s user guide for specific instructions for your machine.