Ubuntu prompts a start job is running for wait for network to be configured when booting up, which is a problem that occurs when configuring the network and may require waiting for up to two minutes.
This is because of the software systemd-networkd-wait-online that starts automatically at boot, which ensures network connectivity (at least one network card) with a default timeout of 2 minutes.
Solution: https://magiclen.org/ubuntu-start-job-wait-network/