The last Puppet run was at Tue Oct 31 05:49:07 UTC 2017 (6231 minutes ago).
Puppet runs only currently if I do that manually. I don't know why.
I fixed this already three times, by doing: sudo puppet agent -tv => logout => login => sudo puppet agent -tv => logout => login
After that, puppet was executed successfully. I don't get any errors during puppet agent -tv. So, if I execute this, puppet seems ok then, but puppet does not run automatically.