Comment 17 for bug 1577520

FYI, while the addition of the 'process-control' interface fixed this for people, snapd 2.23 will have changes in the default template that will allow certain uses of setpriority to work without process-control (specifically, when using (setpriority(PRIO_PROCESS, 0, 0-19), which is a common use case). For the other uses, process-control is of course still available to use.