Apt Mirror

$ apt-get install apt-mirror
$ nano /etc/apt/mirror.list
$ sudo apt-mirror

/etc/apt/mirror.list

############# config ##################
set base_path /var/spool/apt-mirror

set mirror_path $base_path/mirror
set skel_path $base_path/skel
set var_path $base_path/var
set cleanscript $var_path/clean.sh
set defaultarch amd64
set postmirror_script $var_path/postmirror.sh
set run_postmirror 0
set nthreads 4
set limit_rate 256k
set _tilde 0
############# end config ##############

deb-amd64 http://archive.ubuntu.com/ubuntu xenial main main/debian-installer restricted restricted/debian-installer universe multiverse
deb-amd64 http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-amd64 http://archive.ubuntu.com/ubuntu xenial-updates main main/debian-installer restricted restricted/debian-installer universe multiverse
deb-amd64 http://archive.ubuntu.com/ubuntu xenial-proposed main restricted universe multiverse
deb-amd64 http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu xenial main main/debian-installer restricted restricted/debian-installer universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse

clean http://archive.ubuntu.com/ubuntu

# Gitlab
# this file was generated by packages.gitlab.com for
# the repository at https://packages.gitlab.com/gitlab/gitlab-ce
deb https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu/ xenial main
deb-src https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu/ xenial main

# NodeJS
deb https://deb.nodesource.com/node_6.x xenial main
deb-src https://deb.nodesource.com/node_6.x xenial main

# MongoDB
deb [arch=amd64,arm64] http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4 multiverse