setup-ubuntu.sh

#!/bin/bash
echo "Simple Ubuntu Updater v1.0.1 (14.04 -> 18.04) (Use at your own risk)"
rel=`lsb_release -r`
if [[ $rel = *"18.04" ]]; then
  echo "Already on 18.04!"
  exit
fi

if [ `whoami` != "root" ]; then
  echo "Script must be run as root."
  exit
fi

if [ ! -f /root/setup-ubuntu.sh ]; then
  echo "The 'setup-ubuntu.sh' script must be placed in '/root/setup-ubuntu.sh'!"
  exit
fi

if [[ $rel = *"16.04" ]]; then
  echo
  echo "Upgrading 16.04 -> 18.04..."
  echo
  sleep 3
  sed -i '$d' .bashrc
  do-release-upgrade -dm server
  exit
fi

if [[ $rel = *"14.04" ]]; then
  echo
  echo "Upgrading 14.04 -> 16.04..."
  echo
  sleep 3
  echo "/root/setup-ubuntu.sh" >> /root/.bashrc
  do-release-upgrade -pm server
  exit
fi