# Preparing the Computer for Installation

#### Backup Recommendations

> ⚠️ Warning: Installing an operating system involves formatting disk partitions. Back up all essential files, SSH keys, and code repositories to an external drive or cloud storage before proceeding.

#### Disk Partitioning Basics

When installing Ubuntu, you can either erase the whole disk or create manual partitions. For developers, manual partitioning is highly recommended:

* EFI (`/boot/efi`): \~500MB. Required for UEFI systems to boot the OS.
* Root (`/`): \~40GB - 60GB. The core system where Ubuntu and your apps are installed.
* Home (`/home`): The remaining space. Where your personal files, projects, and custom configurations live.

#### Booting from USB via Advanced Startup (Windows)

Modern Windows PCs boot so fast you might miss the BIOS key.

1. Go to **Settings → System → Recovery** and click **Restart now** under **Advanced startup**.\
   After the PC restarts, open **Troubleshoot → Advanced Options → UEFI Firmware Settings** to disable **Secure Boot**, or choose **Use a Device** and select your **USB drive**.


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