#!/bin/sh -eux
export DEBIAN_FRONTEND=noninteractive

# Disable release-upgrades
sed -i.bak 's/^Prompt=.*$/Prompt=never/' /etc/update-manager/release-upgrades

# Disable systemd apt timers/services
systemctl stop apt-daily.timer
systemctl stop apt-daily-upgrade.timer
systemctl disable apt-daily.timer
systemctl disable apt-daily-upgrade.timer
systemctl mask apt-daily.service
systemctl mask apt-daily-upgrade.service
systemctl daemon-reload

# Disable periodic activities of apt to be safe
cat <<EOF >/etc/apt/apt.conf.d/10periodic;
APT::Periodic::Enable "0";
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "0";
EOF

# Clean and nuke the package from orbit
rm -rf /var/log/unattended-upgrades
apt-get -y purge unattended-upgrades

# Update the package list
apt-get -y update

# Upgrade all installed packages incl. kernel and kernel headers
apt-get -y dist-upgrade -o Dpkg::Options::="--force-confnew"

# Install QEMU guest agent
apt-get install qemu-guest-agent

reboot