Upgrade EOL version of Ubuntu

force-release-upgrade.sh

#!/bin/bash

# This script will perform the same function as `do-release-upgrade` when that tool is giving
# an error for an EOL verison of Ubuntu, or some other "cannot upgrade from <current> to <next>".
# It does this safely by downloading the release-upgrade meta-pacakge from your target distribution.
#
# See https://help.ubuntu.com/community/EOLUpgrades/ for more information.

# Make sure a release is given as argument
if [[ "$1" == "" ]]; then
  echo "Usage: ./$(basename $0) <release_codename_to_update_to>"
  exit 2
fi

CURRENT_RELEASE="$(lsb_release -sc)"
TARGET_RELEASE="${1,,}"

# If apt-get update fails to find a release file, switch to old-releases instead of archive
apt-get update
if [[ $? -ne 0 ]]; then
  echo 'apt-update failed. Trying old-releases repository...'
  sed "s/http:\/\/.*archive\./http:\/\/old-releases./g" /etc/apt/sources.list
fi

# Try again
apt-get update
if [[ $? -ne 0 ]]; then
  echo 'Still not working, idk...'
fi

cd /tmp
wget "$(curl -sSL 'https://changelogs.ubuntu.com/meta-release' | grep -E '^UpgradeTool:' | grep "$TARGET_RELEASE" | cut -d ' ' -f 2)" -O ${TARGET_RELEASE}.tar.gz
rm -r /tmp/updater
mkdir /tmp/updater
tar -xvf ${TARGET_RELEASE}.tar.gz -C updater
cd updater
./${TARGET_RELEASE}