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No. But when I performed the check on the unmounted system it ended without an error message. Thanks.

Probably not. Will check when I boot Linux again.

It is a bit confusing when you run an repair on a partition that needs fixing and you get the following Error message (https://ibb.co/4pZ7ghy):

Error while repairing filesystem
Error repairing...

I bought this system in the UK. I had to install Windows on it. I did not made the conscious decision to "install [a] modern Windows in Legacy/"BIOS" mode and MBR in a UEFI machine".

Next I did...

I will do that. I have to correct the "set MBR back" error and am hoping on feedback from Windows forums on that account.

Edit: This is no fun for me either. My system is down since the beginning...

The new Boot-Repair summary report can be found here.

@CelticWarrior May bad. I will change the drive order of my machine in the BIOS to start with the Ubuntu disk.

@OldFred Will the Boot-Repair summary report be different of the one I posted at the...

No.

On your request I disconnected the Linux HD and booted. It now hangs on the following error message:


As I wanted to print, which is not possible under Linux, I booted the rescue DVD and...

Are you thinking I am still working with a mixed mode UEFI/Legacy BIOS system? I stated in my original post (quoted above, with the relevant part red) that everything is working UEFI.
...

The only way I can get Ubuntu started is by installing it from Live DVD. If I remember correct, the last installation even failed.

On the other question, yes, I indeed have a

<F12> Boot menu...

I have a "one boot system only" at the moment. If I restore the MBR I can boot Windows. If I install from Live DVD I can run Ubuntu. Not an ideal situation.

How does an UEFI boot menu look like....

I did not see an UEFI boot menu.

Yes. Both could be booted.

Edit:
FWIW: A sudo fdisk -l informed me that

I would not know what disk has a corrupt GPT table. The Ubuntu disk?

My computer is a dual boot, dual HD, AMD system that does not display a Grub menu. First things first my boot-repair result https://paste.ubuntu.com/p/dRKN6Tnt5t/.

My BIOS is now instructed to...

Now I can dive into this, buy me an external HD to back up my Windows HD (do I also backup the Linux HD). This costs money, and caries the risk of failure, or I can go back to the situation I had...

During my forum session at Microsoft I had to offer a picture of my BIOS Security Tab. I had none.
https://ibb.co/BGrx3D6

Next I was asked to provide him with a picture of my System Information....

Some time has past. But I finally succeeded in booting my Windows, after disconnecting my Linux HD. Working with your counterpart from the Microsoft forums I found out I actually "may not have a UEFI...

My latest pastebin: https://paste.ubuntu.com/p/k75Y9Pfkp3/

I hoped on better times, with the biosboot partition. But sad to say (again), no :-{.

Use suggest syslinux? Like

syslinux...

Nope, again. I got the same error:

error: No such device: 4a8ddd8d-09fd-4394-8f24-4631dc80ea19
Entering rescue mode ...
grub rescue>

Accompanying pastebin:...

I got an 'Installation complete' message after installation. But after reboot I got after 'Verifying DMI Pool Data .....'

error: No such device: 4a8ddd8d-09fd-4394-8f24-4631dc80ea19
Entering...

FWIW, I will be reinstalling Windows, now on UEFI. But first I am hoping on a successful Ubuntu installation with a 200 Mb UEFI partition, which worked before.and I will be backing up data, just for...

You are right. After writing my question I tried it and succeeded. But besides data (all probably in the 'My Documents' directory (eg. in /media/ubuntu/Windows 10/Users/macamba/Documents :)). But it...

I only need one Ubuntu and one Windows. Can I remove Ubuntu 18.04.5 LTS on sda4? Is it possible to get the Ubuntu installation back to the legacy situation?

To be able to backup Windows I need to...

Facepalm moment :-}

Thanks:
https://paste.ubuntu.com/p/frGh3gFkgm/

By the bye, a “Verifying DMI Pool Data ....” error message implies hardware troubles. I did not change my hardware...

I don't know how to proceed. Do I start with the installation process ('Install Ubuntu 20.04.1 LTS' icon in my Unity Launcher (the bar to the left))? I take it you are not talking about the 'Updates...