Ubuntu bash script to join PC to Domain and add a given group to do sudo without password

ubuntu18-joinad.sh

#!/bin/bash
# Simplest script to join ubuntu 18 to AD

declare user=user
declare group=ADGroup
declare sudo_group=${group}
declare domain=domain.com
declare dns_servers="1.1.1.1, 4.4.4.4"
declare dns_search="domain.lan, domain.local"

sudo apt update
sudo apt install -y realmd packagekit sssd sssd-tools adcli libpam-sss
sudo sed -i "/dhcp4: true.*/a \      nameservers:\n        addresses: [${dns_servers}]\n        search: [${dns_search}]" /etc/netplan/00-installer-config.yaml
sudo netplan apply
sudo echo -e "\nsession optional pam_mkhomedir.so skel=/etc/skel umask=077" | sudo tee -a  /etc/pam.d/common-session
sudo sleep 1 && sudo realm join -v -U ${user} ${domain}
sudo sed -i '/use_fully_qualified_names/ s/^#*/#/' /etc/sssd/sssd.conf
sudo sed -i 's/\/home\/%u@%d/\/home\/%u/g' /etc/sssd/sssd.conf
sudo realm permit -g "${group}"
if [[ ! -z "$sudo_group" ]]; then
    echo "%${group}      ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/domain_sudo_group
fi

sudo systemctl restart sssd