Comment 1 for bug 1870087

Interestingly, I had the same problem on another machine, but with a different lockfile:

FileExistsError: [Errno 17] File exists: '1516' -> b'/var/lib/landscape/client/sockets/monitor.sock.lock'

So I think there is some situation, possibly an upgrade from bionic to focal, which is causing lost lockfiles which then block future starts.