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).
Status in vbetool package in Ubuntu:
Fix Released
Bug description:
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 5.4.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sun Apr 26 15:20:56 2020
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: vbetool
UpgradeStatus: Upgraded to focal on 2020-04-26 (0 days ago)
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