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# Ubuntu
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## OS Installation
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Download and boot the [last Ubuntu release](https://releases.ubuntu.com/21.04/ubuntu-21.04-desktop-amd64.iso).
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Follow the steps :
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The partitioning is :
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1. 256 MB : EFI partition
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2. 20 GB : system partition
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Remove the installation disk and then reboot.
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Skip the welcoming window.
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Don't install updates if Ubuntu asks to. The scripts will.
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## Admin access
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This is optional but you can add your public SSH key to access the administrator account later:
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```shell
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sudo mkdir /root/.ssh
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echo 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICeJ9WuncQJG5X51m3M0goX9fohnz9LqlL/AT3OMYBX1' | sudo tee /root/.ssh/authorized_keys
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sudo chmod 400 !$
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```
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## OS configuration
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Run a terminal and type these commands :
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```shell
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unset HISTFILE
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sudo apt -y install git
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git clone https://github.com/01-edu/public.git
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public/sh/debian/ubuntu/setup.sh
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```
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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.
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The system is now read-only, every data is written to a temporary partition.
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The session is password-less.
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To gain a superuser terminal, use SSH :
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```console
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user@remote:~$ ssh -p521 root@IP_ADDRESS
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```
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To gain access with read/write access to the filesystem, use this command :
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```console
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root@ubuntu:~# overlayroot-chroot
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INFO: Chrooting into [/media/root-ro]
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root@ubuntu:/#
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```
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