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7020100
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Hello
This "legacy only" computer is old. It now contains an SSD disk composed of four partitions including windows 10 and ubuntu 20.04.
Another disk containing windows XP and windows 7.
A third larger disc containing the duplications of the two preceding discs.
I know the ubuntu boots fairly well since I participate in an important way in the EFI part with another computer in the following documentations,
https:/
https:/
I noticed that the installation of ubuntu has changed a lot with version 20.04.
So I want to see how version 21.04 will behave.
So I decided to use this 64-bit computer which only knows the LEGACY mode to install the future version 21.04 on an external hard drive by choosing to overwrite the entire drive.
(I often used the option something else.)
The installer therefore overwrote the ms-dos partition table to install a GPT partition table.
Everything is going well. The boot is done well with this external drive. But I get the quoted message which is the subject of my correction request.
I don't quite know how to understand it. I saw that it was cited a lot several years ago and that it seemed to be a mix between 32 bit mods and 64 bit mods.
Subsequently I have the following tests:
Boot the ubuntu from the SSD (20.04.1). Make him discover the O.S. Installed. He forgets to look at the contents of the external disks !!!
So I duplicated by gparted the root partition 21.01 in the big disk and restarted the detection. At the next boot, I can choose version 21.04 (the duplication of the external disk in the large 3 TB disk formatted GPT). It works. I even updated it yesterday.
I also plugged the external drive into my laptop which is in efi.
The boot works perfectly well!
It is possible that installing version 20.04 or version 20.10 will give the same result. I did not try.
Hope this can be of help to you.