To perform a memory test on an installed Ubuntu system, use the following steps:
- Turn on or restart the system
Press the Escape key when you see this message:
Press `ESC' to enter the menu
Use the arrow keys to move to the entry labeled Memory test or memtest86+
Press Enter. The test will run automatically, and continue until you end it by pressing the Escape key
- Allow the test to run for at least one full pass