seems I was mistaken: Matthias explained today that "whatever works, as long as the string "pureos" with a version number suffix appears in there".

Can one install PureOS wihout a monitor and mouse? I.e. using only a keyboard.

Fascinating. I believe this is a bug in GNOME. I'll see if there is a suitable place for it upstream.

Is this a duplicate for #T935?

There are parts of the EFI stack that are proprietary, this is why we do not include them in our installer. Other projects may include them in their "non-free" repos but because we're a FSF compliant Free Software distro we don't include non-free repositories. We continue to investigate if there is a way to support GPT.

Had the same issue, I fixed it by enabling Compatibility Support Module (CSM) in BIOS. Hope this can help others as well.

Run cpu-x. Get this message;