ubuntu_apt_mirrors.sh

#!/usr/bin/env bash

# Find the fastest apt mirror
# Adapted from http://askubuntu.com/questions/39922/how-do-you-select-the-fastest-mirror-from-the-command-line/141536#141536

IFS=$'\n' read -d '' -r -a HOSTS < <(
  wget -q -O- https://launchpad.net/ubuntu/+archivemirrors |
  grep -P -B8 'statusUP|statusSIX' | 
  grep -o -P '(f|ht)tp[^"]*"' | sed 's/"$//'
)

sudo netselect -v -s10 -t30 "${HOSTS[@]}" | tee -i mirrors.txt
echo

TOP_HOST=$(
  head -n1 mirrors.txt |
    tr -s ' ' ' ' |
    cut -d' ' -f3
)

OLD_HOST=$(
  grep '^deb' /etc/apt/sources.list | 
    cut -d' ' -f2 | 
    sort | uniq -c | sort -d | 
    head -n1 | 
    tr -s ' ' ' ' | 
    cut -d' ' -f3
)

echo "sudo sed -i'~' 's!${OLD_HOST/./\\.}!${TOP_HOST}!' /etc/apt/sources.list"