Mistakes were made.

(a) sudo mount -o remount,exec /dev

Works.

The mistake made was rebooting before testing vbetool.

Solution:

sudo mount -o remount,exec /dev
vbetool dpms force off
sudo mount -o remount,noexec /dev

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https://bugs.launchpad.net/bugs/1875240

Title:
  vbetool: mmap /dev/zero: Operation not permitted
  Failed to initialise LRMI (Linux Real-Mode Interface).

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