Linux 101 : Troubleshooting a system startup

To diagnose a slow starting system, we could use a systemd tool called -  systemd-analyze - as follow:

It shows us the list of processes that start at boot time and also the time that it takes them to start.
We could use this information to remove some programs from the startup list so that our system starts quicker.

We could also use it to have a big picture about the stating time for the different stages - userspace, firmware and kernel -:


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