When checking the systemd-analyze tool by running systemd-analyze blame I’ve also noticed that the NetworkManager-wait-online.service took about 8 seconds to start.
It seems that according to https://askubuntu.com/questions/1018576/what-does-networkmanager-wait-online-service-do this can be safely disabled by:
sudo systemctl disable NetworkManager-wait-online.service
Previous boot time:
Startup finished in 2.348s (firmware) + 3.988s (loader) + 6.232s (kernel) + 12.818s (userspace) = 25.387s
graphical.target reached after 12.797s in userspace
New boot time:
Startup finished in 2.080s (firmware) + 4.884s (loader) + 6.282s (kernel) + 4.769s (userspace) = 18.017s
So improvement by ~ 30%.
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