Is there a reset procedure for the Canon MP258 that might clear the E05 error?

While there isn't a specific 'reset' button for this error, a power cycle can sometimes help. Unplug the printer from the power outlet for at least 60 seconds, then plug it back in and turn it on. This can sometimes clear temporary errors. If that doesn't work, a factory reset (consult your manual) might be an option, but it will erase custom settings.