🟣 Manual Partitioning in Ubuntu 20.04 (Step‑by‑Step)

 🟦 1. Start the Installer:

 

• Boot from your Ubuntu 20.04 USB.

• Choose Install Ubuntu.

• Continue until you reach Installation type.

• Select Something else → this opens the full partition editor.

🟧 2. Create or Select a Partition Table:

 If the disk is new or you want a clean layout:

• Select the disk (e.g., /dev/sda)

• Click New Partition Table

• Confirm (this wipes the disk)

UEFI systems → GPT is recommended

Legacy BIOS systems → MBR works, but GPT still preferred

🟩 3. Create Required Partitions (UEFI Layout):

 Ubuntu 20.04 works perfectly with the modern UEFI + GPT scheme. 

🟨 Partition 1 — EFI System Partition (ESP)

Required for UEFI boot.

Setting	Value
Size	300–512 MB
Type	FAT32
Use as	EFI System Partition
Mount point	/boot/efi

If Windows is installed → reuse the existing EFI partition.

🟦 Partition 2 — Swap (optional)

Ubuntu 20.04 uses a swap file by default, but manual partitioning allows a dedicated swap partition.

RAM	Recommended Swap
8–16 GB	2–4 GB
16–32 GB	2 GB
Hibernation	RAM size

Setting	Value
Type	Linux swap

🟥 Partition 3 — Root (/)

This is the main system partition.

Setting	Value
Size	25–50 GB minimum
Type	ext4
Mount point	/

🟩 Partition 4 — Home (/home) (optional)

Keeps your personal files separate from the OS.

Setting	Value
Size	Remaining space
Type	ext4
Mount point	/home

🟦 4. Set Bootloader Location

At the bottom:

Install bootloader to: /dev/sdX (the disk, not a partition)

Examples: ✔ /dev/sda ✘ /dev/sda1




🟪 5. Apply Changes

• Click Install Now

• Review the summary

• Confirm

Ubuntu will format the partitions and begin installation.

🟣 Recommended Layout Summary (UEFI + GPT)

Partition	Size	Filesystem	Mount Point	Notes
EFI	300–512 MB	FAT32	/boot/efi	Required
Swap	2–4 GB	swap	—	Optional
Root	25–50 GB+	ext4	/	Required
Home	Rest of disk	ext4	/home	Optional

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