Hello list, moderators!
Can I fix my attempted 12.2-64/12.3 dual boot without starting over?
I read a few of the UEFI posts to this list, but none of them gave me an answer to my dilemma. Understand up front that I have a wonderful 12.3 running on my HW, which reduces the urgency of a solution to a dual boot. My mobo is Asus P8Z77-M LK which has UEFI BIOS.
So here’s what I did and what I ended up with. Before I installed my 12.2-64 a week or so ago, I partitioned my new barebones 1TB Toshiba Sata with the latest, live gparted. Since 12.3 was almost released then, I created a pair of / partitions and a pair of /home partitions, all ext4.
With an install DVD, I installed the 12.2-64 on the second pair of / and /home, but mounted the first pair. it was the first OS on the new HW and worked OK. A week later I could order a 12.3 install DVD and when it came, I installed it into the second pair of / and /home. Again I mounted the first pair, this time as /12.2 and /home1.
Between the 12.3-64 and the 12.3 are two common partitions /boot and /swap.
Now when the system boots grub2 shows OSs and failsafe choices in the boot menu for each OS. Picking 12.2 is ignored - 12.3 always boots.
I’ve tried the function keys like F12 on bootup, without effect. F2 does open up the UEFI bios, but I don’t see references to 12.2 or 12.3. I’ve looked at /boot/grub2/grub.cfg. All four menus are in that, but only the / partition for the 12.3 is mentioned (sda10).
I think with the right syntax and alternate / partition edited into grub.cfg, my system would dual boot properly. Am I correct in that thought, or have I been trumped by my own UEFI? Heboland.