- Motherboard: ASUS ROG Maximus VII Ranger; UEFI BIOS
- Processor: Intel i7-4790K; 4GHZ
- RAM: 16GB DDR3
- GPU: nVidia GTX960
- SDD: 500GB, MBR, Windows7
- HDD1: 600GB, MBR, NTFS data storage
- HDD2: 500GB, MBR, Ubuntu 18.04, Mint 19.2 Tessa, KDE Neon
Four partitions were created using Gparted from the installation media: One for bios_grub, one for UEFI, one for swap, and one ext4 (refer to the attachment). Installation of Linux Mint 19.2 progressed as expected. The next step is to boot into the newly installed OS via MBR/BIOS. The memory stick is not recognized as a bootable device and thus I cannot proceed to install the UEFI bootloader.
I tried to mount the bios_grub partition to see what is in there but received an error message saying the file system is unknown because it's not listed in /etc/fstab. Thus I am stalled at this point because I cannot boot into the Mint installed on the USB memory stick.
As noted in my system description, Linux Mint 19.2 Tessa (not Tina) is installed on a multi-boot hard drive and runs as expected. The only difference between the HDD and the flash memory installs is that the HDD uses an msdos partition table while the USB memory uses gpt per instructions found in the tutorial.
Firmware on the motherboard is:
64Mb UEFI AMI BIOS, PnP, DMI2.7, WfM2.0, SM BIOS 2.7, ACPI5.0a, Multi‐Language BIOS
I set the eeprom to legacy BIOS boot only given that I do not need UEFI on this machine. The boot device order is set to look at the USB port first, but I can select it manually. I also attempted this hybrid boot using KDE Neon instead of Mint, but it still will not boot. And, I created a USB installation allowing the installer to set the partitions and format – didn't use “something else” during install. This version boots as expected which I assume is due to the fact the partition table is not gpt in that instance.
Any help on how to fix this problem would be appreciated.