Displaying the system state:

To display the system state, we use the below command:



We can also usethe command "systemd-analyze" to see how long it took the system to boot:


We can even investigate deeper by running the below command:


We see that the "NetworkManager-wait-online.service" waits around thirty seconds before failing.

The "NetworkManager-wait-online.service" service:

NetworkManager-wait-online.service waits for NetworkManager to set up the system connections or it waits thirty second before timing out. 
It waits, so the rest of the services can have a connection to the outside to be able to communicate with the network drives or to communicate with a database for example.

Disabling the "NetworkManager-wait-online.service" service:

To avoid the degraded state, we could disable the service it doesn't start at boot time:


We can also mask the service so it can't be started manually:


Listing the "failed" services:

To list the "failed" services, we could also use the below:


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