patch 8.2.4642: Vim9: in :def function script var cannot be null Commit: https://github.com/vim/vim/commit/859cc21c6b60af07b549456b7d050a03b3e48bc9 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 28 15:22:35 2022 +0100 patch 8.2.4642: Vim9: in :def function script var cannot be null Problem: Vim9: in :def function script var cannot be null. Solution: Only initialize a script variable when not set to a null value. (closes #10034)

#!/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