This thread can be considered 'solved' - in a sense that I created it looking to add LinuxMint 20.3 as an additional item on my multi boot menu.
Now I have 2 ways to do it. After deciding to use GRUB2 bootloader, both 'full install' or 'frugal install (WDL_mintCin)' are acceptable solutions for me. I haven't written report of my experience/findings. Not only too long but also I'm a lazy bugger.
I did also experimenting multiboot on USB. I'll continue using this thread, as it's 'sort of' related.
I have bits/queries that I can put in Ventoy, SG2D, Debian-Live-Bullseye-Starter, or Bullseye-build-script threads (also read those threads on and off too).
I downloaded and tried Clarity's Readymade-ISO, Ventoy-1.0.75, etc...etc...
I'm going to narrow the scope to one of the laptops used that's of my interest most.
SSD from scratch, GPT, sda1 - 500MB boot ext3, sda2 - 51GB ext4, installed GRUB2, stage1, stage2 as per rcrsn51 'recommendation' in 'somewhere'. Put few frugals (sda2) with deb-live-multi-installer-2. All working fine, as far as I can tell.
I created Ventoy-1.0-75 bootable using a 32GB thumb drive.
My interest is to find out, why 'all' Bullseye ISOs do not work. While 'others' work - see screenshot, all with green block -> work.
Focusing on Debian - At first, I noticed that both busterdog & stretchdog isos have initrd.img file, and I did make bullseye isos without it back then.
So, I remake new ISOs. It's still not working.
I was gonna ask in Bullseye-build-script thread, so Fred can do sanity check of my build, whether those warnings matter, attached log.
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Generate initrd.img . . .
W: Possible missing firmware /lib/firmware/tigon/tg3_tso5.bin for module tg3
W: Possible missing firmware /lib/firmware/tigon/tg3_tso.bin for module tg3
W: Possible missing firmware /lib/firmware/tigon/tg3.bin for module tg3
cryptsetup: WARNING: Couldn't determine root device
live-boot: core filesystems devices utils udev blockdev ftpfs dns.
Working files in /var/tmp/mkinitramfs_XREthU, early initramfs in /var/tmp/mkinitramfs-FW_w1ND3S, main initramfs in /var/tmp/mkinitramfs-MAIN_VsfnIP and overlay in /var/tmp/mkinitramfs-OL_2BbO2C
Generating porteus-boot initrd1.xz . . .
Done ! /tmp/initrd1.xz
Cleaning...
Unmounting mount binds in chroot