How to Access the Advanced Startup Menu in Ubuntu
If you’ve ever dual-booted Ubuntu with another operating system, you’ll be well acquainted with the text-based GRUB boot menu. One entry in this menu is Memtest, which comes with Ubuntu by default. However, if you don’t have a dual-boot system, how do you access this menu? You might think it would be to repeatedly tap F8 like Windows, but the feature is much more Mac-like: hold down the Shift key after the system posts. This will bring up the GRUB menu and allow you to access recovery options and Memtest.