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I eventually 'solved it'/worked around it by continually bashing it to delete/clear a partition that was marked as efi boot. It took repeated starts of the desktop-live iso, then something clicked and I tried the installer iso again and it went through.
Some how,when I first used the installer iso, it didn't actually install the basic system and the amd-firmware files, so when it came back to reboot/finish the install, it hung up with the scrambled amd graphics problem. At best. I could get a grub prompt which enabled me to see that there was no kernel, etc files.
The problem then was that every time I tried the installer iso, it was scrambled graphics, which was why I was using attempting an install with the desktop-live, which also kept on failing.
The motherboard is an ASUS B550M-A and I expected it to be like the ASUS B350 which has a very clear bios setting of legacy or UEFI boot. Lucked out there with the new motherboard. I've stuck with legacy boot as previous attempts to use UEFI boots have been repeatedly unsuccessful.
I usually stick with stable as this is my main/only "work" computer and I have tasks to carry out.
Went to backports when the 'present" was a AMD RX 5700 XT gpu with dual 2K monitors. Really could have used that decades ago when crunching text/documents.
Any way, thanks everyone for their ideas. As usual, a solution is eventually arrived at..
Thank you for you ideas, but no go.
There is no bootable system on the SDDs/HDD and there is no sudo on a chimaera-live iso.
Unfortunately this HW ASUS B350 motherboard does not have a clear efi or legacy boot setting.
I had another go at an install with live iso, blowing all the previous install away and all I ended yo was GRUB being continually streamed across the screen, which required a power olf to clear it.
A previous attempt to install Devuan chimaera on new, clean hardware crashed.
As this system has a amdgpu installed installed it isn't possible to simple attempt a fresh install as the graphics are scambled and unreadable. Previously, i could swap out the gpu to something non-amd, but I have no other gpu/videos ion stock and it would be about a fortnight delay and rather expensive.
Unfortunatly, there is nothing of the kernel.image.vmlinuz installed so I can not follow the set-root/linux/initrd/boot proceedure and I know of no way of moving file via the grub prompt.
So, I'm trying to get a system installed via the devuan-live iso install script.
The problem is an efi boot partition and once again, efi booting will not work.
So I need to wipe out the efi-boot setting and hopefully replace it with a legacy-grub boot.
Unfortunately, repeated attempts to do this alway reach a stage where it wants to set an efit boot. at which point i exit and try again.
Can anyone give me some tips to overcome this? T.I.A.
My 2c is you have fallen into the AMD 700 tar pit where it takes years until any 'bleeding edge' AMD hardware with 700 in the name to be supported.
My first encounter was the AMD HJD 5700 under the proprietay catalyst series. AMD never properly supported it and I had to waitmyears until mthe FOSS Radeon driver was able to handle it.
I now have a AMD RX 5700 XT, which wasn't supported under Devuan-beowulf, even with the 5.10 kernel. I had to gamble with Devuan-chimera to have it run ONE monityor via DP. If I want to use the second monitor,. There is something in the kernel that crashes with dual DP monitors.
I suspect your RX 6700 just confirms my experienceswith AMD X700s.
How hard was it to drg in the latest stuff (vulkan, mesa, ?) frp gits and get it running. it is decades since I was compiling kernels from source foe minimalisation.
Short Answer; Aisleriot Solitare or Tetravex for quickies. Recently Widelands, but currently chasing up stuff like Runescape, Rift. Tera & WoW, which at various times I've had running under Linux.
Simce i've been retired($ work) for 15 years and wider community projects (~5 years) and have no interest in the idiot box mindless podcast, there is only the garden, etc and games. Especially when it is inclement weather.
Currently, Linux has a whole host of 'native' games to locate(aptitude search games) and explore. Many are historical and thus non-taxin g on any system. a lot suffer from lack of documentation. A few, variously do not work.
If you are looking to install MS OS games, then search PlayOnLinux first as there whereitall may be there to just run and enjoy. If you have any scripting abilities and there is nothing there for your game, look for something similar and see if you can adapt it. My fiddle today was rolling a beta script to install Skydome ( a newy from Gamingo/Trion Games) installed enough to be able to install it under PoL and decide it isn't my type of game ( Ranked FPS blech!).
Unfortunately, the offerings unde PoL are very much shiting sands as distros change and worse, the game requirements change, so ATM WoW BattlelNet doesn't install and work.
At one stage there were CDs/DVDs of commercial Linux games where the only trouble was changing libraries. This seems to have all disappeared undera flood of arcade style shooters through Steam, which requires a subscription. If using Steam, Gog, Humble Bundle and the like is your style, then Lutris is probably what you could use to centralise all their games..
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