patch 8.2.3462: ModeChanged only uses one character for new_mode and old_mode Commit: https://github.com/vim/vim/commit/d85931e67316e824878000d0ead122553ccef3a4 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Oct 2 16:55:39 2021 +0100 patch 8.2.3462: ModeChanged only uses one character for new_mode and old_mode Problem: The ModeChanged event only uses one character for the new_mode and old_mode values. Solution: Pass one as first argument to mode(). (issue #8856)

#!/bin/bash
set -e

apt-get install -y xvfb

cat <<EOT >/etc/systemd/system/xvfb.service
[Unit]
Description=X Virtual Frame Buffer Service
After=network.target
[Service]
ExecStart=/usr/bin/Xvfb :99 -screen 0 1024x768x24
[Install]
WantedBy=multi-user.target
EOT

systemctl enable xvfb.service
systemctl start xvfb.service