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This document introduces how to set up automatic login on Ubuntu.
Settings ⇒ Users ⇒ Automatic Login
sudo cp /lib/systemd/system/getty@.service /lib/systemd/system/getty@.service.backup sudo sed -i "s/ExecStart=.*/ExecStart=-\/sbin\/agetty --noclear --autologin root \%I \$TERM/g" /lib/systemd/system/getty@.service
sudo cp /lib/systemd/system/serial-getty@.service /lib/systemd/system/serial-getty@.service.backup sudo sed -i "s/ExecStart=.*/ExecStart=-\/sbin\/agetty --autologin root --keep-baud 1500000,115200,38400,9600 \%I \$TERM/g" /lib/systemd/system/serial-getty@.service
Reboot for the changes to take effect.
To restore the login prompt, follow these steps:
sudo mv /lib/systemd/system/getty@.service.backup /lib/systemd/system/getty@.service sudo mv /lib/systemd/system/serial-getty@.service.backup /lib/systemd/system/serial-getty@.service