Missing 'Reboot Now' update warning

General system Kernel, boot, graphics & hardware
116

Here’s another small bash script for you to try. It should show the notification as-is.
It is doesn’t, can you try other values for: urgency and/or expiretime.

Save the script to file /tmp/test and make it executable.
Run it with command
sudo /tmp/test denalb

#!/bin/bash

DIE() {
    local progname=${0##*/}
    echo -e "==> $progname: error: $1" >&2
    exit 1
}

Main() {
    local user="$1"
    [ "$user" ] || DIE "please give your user name."

    local userid="$(/bin/id -u "$user")"

    local appname="testing app"
    local icon="info"
    local title="my title"
    local message="my message"

    local urgency="normal"          # values: low, normal, critical
    local expiretime=0              # or 3000; value in milliseconds

    local command=(
        DISPLAY=:0
        WAYLAND_DISPLAY=wayland-0
        DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/$userid/bus"
        notify-send
        --icon="'$icon'"
        --urgency="'$urgency'"
        --expire-time="'$expiretime'"
        --app-name="'$appname'"
        "'$title'"
        "'$message'"
    )
    /bin/sudo -u "$user" bash -c "${command[*]}"
}

Main "$@"