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# Ubuntu
## OS Installation
Download and boot the [latest Ubuntu release](https://releases.ubuntu.com/21.04/ubuntu-21.04-desktop-amd64.iso).
Follow the steps with these customizations:
![img1](img/ubuntu-installation/1.png)
![img2](img/ubuntu-installation/2.png)
![img3](img/ubuntu-installation/3.png)
The partitioning is:
1. 256 MB : EFI partition
2. 20 GB : system partition
![img4](img/ubuntu-installation/4.png)
![img5](img/ubuntu-installation/5.png)
Remove the installation disk and then reboot.
Skip the welcoming window.
Don't install updates if Ubuntu asks to. The scripts will.
## Admin access
You can add your public SSH key to access the administrator account later:
```shell
unset HISTFILE
sudo mkdir /root/.ssh
sudo wget github.com/xpetit.keys --output-document !$/authorized_keys
sudo chmod 400 !$
```
## OS configuration
Run a terminal and type these commands:
```shell
unset HISTFILE
sudo apt -y install git
git clone https://github.com/01-edu/public.git
public/sh/debian/ubuntu/setup.sh
```
The script will ask for student user password (which will be deleted after) and then after a long configuration process it will restart the computer.
The system is now read-only, every data is written to a temporary partition.
The session is password-less.
To gain a superuser terminal, use SSH:
```console
user@remote:~$ ssh -p512 root@IP_ADDRESS
```
To gain access with read/write access to the filesystem, use this command:
```console
root@ubuntu:~# overlayroot-chroot
INFO: Chrooting into [/media/root-ro]
root@ubuntu:/#
```