So, the repo that we will mirror is the whole focal repository from the official ubuntu

Preparation

Important: Make sure you have external disk with size minimum 500GB for the package

1. Install apt-mirror

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# make sure you have an internet connection

sudo apt update
sudo apt install apt-mirror

2. Setup mirror.list

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cd /etc/apt/
sudo nano mirror.list

############# config ##################
#
# set base_path    
#
set mirror_path  /mirror # depends on your mount path
# set skel_path    $base_path/skel
# set var_path     $base_path/var
# set cleanscript $var_path/clean.sh
# set defaultarch  <running host architecture>
# set postmirror_script $var_path/postmirror.sh
# set run_postmirror 0
set nthreads     20
set _tilde 0
#
############# end config ##############

deb http://archive.ubuntu.com/ubuntu focal universe
deb http://archive.ubuntu.com/ubuntu focal main restricted
deb http://archive.ubuntu.com/ubuntu focal-updates main restricted
deb http://archive.ubuntu.com/ubuntu focal multiverse
deb http://archive.ubuntu.com/ubuntu focal-updates multiverse
deb http://archive.ubuntu.com/ubuntu focal-security main restricted
deb http://archive.ubuntu.com/ubuntu focal-security universe
deb http://archive.ubuntu.com/ubuntu focal-security multiverse

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

Mirroring

3. Run apt-mirror

Note: I’d recommend you to run this on tmux

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apt-mirror

It will take a lot of time depends on your internet speed

Setup web server

In this tutorial i use apache2 for the web server

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sudo apt update
sudo apt install apache2

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ln -s /mirror/archive.ubuntu.com/ubuntu /var/www/html/ubuntu

so the path on repo site if we take a look it will be like this

http://your-address/ubuntu

5. Add cnf

Lately i got some issues after mirroring and testing the repo, it got error about cnf. example:

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E: Failed to fetch http://your-address/ubuntu/dists/focal/main/cnf/Commands-amd64  404  Not Found [IP: localhost 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

it seems like apt-mirror doesn’t bring the cnf, so in order to solve that i make this script

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#!/bin/bash
for p in "${1:-focal}"{,-{security,updates}}\
/{main,restricted,universe,multiverse};do >&2 echo "${p}"
wget  -c -r -np -R "index.html*" "http://archive.ubuntu.com/ubuntu/dists/${p}/cnf/Commands-amd64.xz"
wget  -c -r -np -R "index.html*" "http://archive.ubuntu.com/ubuntu/dists/${p}/cnf/Commands-i386.xz"
done

put the script at the same level path as archive.ubuntu.com for example /mirror/, then run the script.

Verify

On the client side, you can add these following sources.list.

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deb [trusted=yes arch=amd64] http://your-address/ubuntu focal universe
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal main restricted
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal-updates main restricted
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal multiverse
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal-updates multiverse
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal-security main restricted
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal-security universe
deb [trusted=yes arch=amd64] http://your-address/ubuntu focal-security multiverse

And finally you can test it with apt update and install some package