Who doesn’t love dark themes and dark modes? Now, every software or app comes up with an inbuilt dark mode or dark theme. Ubuntu also has an inbuilt dark theme. You can enable dark theme in Ubuntu by following the steps given below.
Go to Settings.
Choose Appearance from the options given in the left pane. Then you can see three inbuilt themes available for Ubuntu 20.04 namely- Light, Standard, and Dark. Just click on the Dark theme and your Ubuntu OS turns into the dark theme instantly.
I hope this short Ubuntu tutorial will be helpful for you.