# 1 How to change to Text Mode (Boot)
linux /boot/vmlinuz-4.18.0-15-generic root=UUID=2338eb20-da3d-4881-cc3a-314e+++0b928 ro quiet splash $vt_handoff 3
3: multi-user.target, 5 : gaphical.target
# 2 How to change to Text Mode (Terminal)
sudo systemctl set-default multi-user.target
systemctl get-default
# 3 How to change to Graphical Mode (Terminal)
sudo systemctl set-default graphical.target