I recently installed Xubuntu version 16.04 by using Legacy mode. UEFI was not working because it had secure boot enabled, and it was not an option to turn off secure boot.
If I tried to boot from my usb with Xubuntu on it, it would show that there was a security boot error. Instead, I switched over to legacy mode and I booted from the usb without problems and installed on empty partitions I made earlier.
Now when I boot up it goes directly to Xubuntu (still in Legacy). However, when I remove the usb drive with Xubuntu on it, it doesn't load anything. My question is, why doesn't the GRUB menu show up? Is this a restriction in Legacy mode? Here is boot info