Having the same problem but I am running a fresh Ubuntu 22.04 live cd
install.
library available:
/usr/lib/pulse-15.99.1+dfsg1
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https://bugs.launchpad.net/bugs/1942949
Title:
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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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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Solution found here:
https://askubuntu.com/questions/1120578/how-do-i-edit-grub-to-add-iomem-relaxed
failed as well.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to:
GRUB_CMDLINE_LINUX_DEFAULT="iomem=relaxed quiet splash"
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That's a negative:
sudo mount -o remount,exec /dev
sudo reboot
results:
[dreaddy@thing ~] :) sudo /usr/sbin/vbetool dpms off
mmap /dev/zero: Operation not permitted
Failed to initialise LRMI (Linux Real-Mode Interface).
[dreaddy@thing ~] :) sudo setsebool -P mmap_low_allowed
results:
sudo
[root@thing ~] :) vbetool dpms force off
mmap /dev/zero: Operation not permitted
Failed to initialise LRMI (Linux Real-Mode Interface).
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1875240
Title:
Public bug reported:
Upgrade from 18.04 to 20.04
As root.
mmap /dev/zero: Operation not permitted
Failed to initialise LRMI (Linux Real-Mode Interface).
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: vbetool 1.1-4
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux
