As stated, run apport-collect from the working 20.04.4 image or collect
the info about which laptops they are and what hardware they have
yourself.
Run grub with set debug=all and capture the output in a video.
I suspect there isn't much we can do here, unfortunately, but without
anything to debug it's clearly not happening.
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1968147
Title:
Unable to boot Ubuntu and Ubuntu flavors on older laptops
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