1

On Ubuntu 16.04.2 I noticed that systemd is in degraded state (systemctl status) after some uptime or after wake from suspend, because dns-clean.service failed.

dns-clean.service has

ExecStartPre=/bin/mkdir /var/run/pppconfig

When I remove /var/run/pppconfig directory which is empty, the service can be started successfully (systemctl start dns-clean.service) and systemd is in running mode.

The directory /var/run/pppconfig is not supposed to exist when the system wants to start the service, so why is it still here ?

There is a Debian bug report about this: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=826040

2

the command mkdir return an error if the directory exist. You can avoid this error using mkdir -p. just edit /lib/systemd/system/dns-clean.service and ajust the line ExecStartPre=/bin/mkdir -p /var/run/pppconfig

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