This tutorial shows you how to reset Gnome Shell to its original status in Ubuntu 18.04 LTS Linux system. Login to your Ubuntu 18.04 system and follow below steps and after that reboot your system.
Reset Gnome Desktop on Ubuntu 18.04
At first, open the Tweaks settings on your system by searching “Tweaks” on your system. Click on Tweaks icon to launch settings as given in below screenshot.
Expand Tweaks select box at top bar of your desktop. You can see “Reset to Defaults” option, click on it as given below.
Once you click on “Reset to Defaults” option it will prompt you for final confirmation to complete Gnome reset to its original settings. Hit on OK button to finish and wait for few seconds to complete.
Finally, it will show success message and you will be prompted for reboot system. Hit on Restart button and it’s done.