How to Shutdown or Restart Ubuntu 18.04 LTS?br br Via System menu:br br Step 1: Go to top Right hand Corner of screen and click on Downward Arrow, and then click on 'Power Off' button.br br Step 2: Now, you will see a Dialog, and from there, you can Restart and Power-Off your Ubuntu.br br br Via Terminal:br br Step 1: Right click on Desktop and Click on 'Open terminal'.