core-agent-linux/qubes-rpc/qubes.InstallUpdatesGUI

#!/bin/sh

# This script should open some GUI to install updates.
# If you are creating package for other distribution, feel free to replace it
# with distribution-specific script.

if [ -e /etc/redhat-release ] && [ -x /usr/bin/dnf ]; then
    update_cmd='dnf update --best'
elif [ -e /etc/redhat-release ] && [ -x /usr/bin/yum ]; then
    update_cmd='yum update'
elif [ -e /etc/debian_version ]; then
    update_cmd='apt-get update && apt-get -V dist-upgrade'
elif [ -e /etc/arch-release ] && [ -x /usr/bin/powerpill ]; then
    update_cmd='powerpill -Suy'
elif [ -e /etc/arch-release ]; then
    update_cmd='pacman -Suy'
else
    update_cmd='echo Unsupported distribution, install updates manually; bash -i'
fi
xterm -title update -e su -s /bin/sh -l -c "$update_cmd; echo Done.; test -f /var/run/qubes/this-is-templatevm && { echo Press Enter to shutdown the template, or Ctrl-C to just close this window; read x && poweroff; } ;"

# Notify dom0 about installed updates
su -s /bin/sh -c 'service qubes-update-check start'