Comment 2 for bug 1816413

The problem seems to be caused by the miscellanea/sosreport_attachment job; deleting that job from /usr/share/plainbox-provider-checkbox/units/miscellanea/test-plan.pxu causes the problem to go away.

Also, the problem seems to occur with certify-advanced, which presents the old menu system for selecting jobs; but when running one of the scripts that does not give the user the ability to select jobs (test-usb), the problem does not occur, even when miscellanea/sosreport_attachment is run.