First, I installed MX Linux 19.4.1 from CD. The CD booted fine and the install proceeded without incident. I kind of cheated and selected the whole disk initially to see how the installer would configure it and then cancelled the file copy process, went back into the partition tools and manually partitioned the SSD. I plan to install at least two Linux distros so the SSD has an ESP partition, an Ext4 partition and a swap partition for MX Linux and another Ext4 and swap partition for Mint. The first problem became apparent immediately after reboot upon which I got the message:
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Operating system loader has no signature.
Incompatible with SecureBoot.
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error: /boot/vmlinuz-5.10.0-5mx-amd64 has invalid signature
error: you need to load the kernel first
Having Googled these errors it would seem that the kernel needs to be signed for SecureBoot and there is a discussion of the process here, although this is for Ubuntu:
https://askubuntu.com/questions/1081472 ... -signature
The other option that is put forward by some is to simply disable SecureBoot. The problem with that option is that Windows 11 is around the corner and when it arrives, I will be installing that onto the SSD that contains the Windows 10 partition. It is my understanding that SecureBoot is mandatory for Windows 11. I therefore would like to avoid tuning it off and would rather proceed with the modern and safer way of doing things.
The question now is, will that procedure in the link work for MX Linux? Is there a recommended way of doing this for MX?
I am also curious why the DVD booted and had not problem with SecureBoot, but the installed system did not and instead reported the first error?