Fast Linux Package Mirrors

cp /etc/apt/sources.list /etc/apt/sources.list.bak
sed '/^#/d' /etc/apt/sources.list.bak | \
sed -E 's/(us|de|ru)\.archive\.ubuntu\.com/mirrors.forestracks.net/g' | \
while IFS='' read -r line || [[ -n "$line" ]]; do
  if [[ $line == deb* ]]; then
    if [[ $line == *security* ]]; then
      # Replace the URL with security.ubuntu.com
      echo "deb http://security.ubuntu.com/ubuntu `echo $line | awk '{print $3}'` `echo $line | awk '{print $4}'`"
    else
      # Replace the URL with mirrors.forestracks.net
      echo $line | sed 's/archive\.ubuntu\.com/mirrors.forestracks.net/g'
    fi
  else
    # Print line as it is
    echo $line
  fi
done > /etc/apt/sources.list