'Job systemd-networkd-wait-online.service/start running' takes a long time

The following method worked for me -

$ ip add

Find the name of your network interface, e.g. wlp3s0

Open the file -

$ sudo vi /usr/lib/systemd/system/systemd-networkd-wait-online.service

Edit the line -

ExecStart=/usr/lib/systemd/systemd-networkd-wait-online

into -

ExecStart=/usr/lib/systemd/systemd-networkd-wait-online --interface=wlp3s0

Then run the command below -

$ sudo systemctl daemon-reload

Reboot your computer.