Solution:
mount -o remount,exec /dev
vbetool dpms force off
mount -o remount,noexec /dev
** Changed in: vbetool (Ubuntu)
Status: New => Fix Released
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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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