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Question: How can I create or modify disk partitions on an Ubuntu system before running the installer?

Answer:

Since you are already running Ubuntu，you can fully prepare the disk before launching the installer。This is actually the cleanest and most reliable approach。Below are three correct methods，from simplest to most controlled。

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Method 1: Use GParted (Recommended, Visual & Safe)

Step 1: Install GParted (if not already installed)

sudo apt update
sudo apt install gparted

Step 2: Launch GParted

sudo gparted

Step 3: Select the correct disk

• Top-right dropdown → choose your main disk (usually /dev/nvme0n1)
• Be very careful not to pick the USB installer

Step 4: Create a clean GPT layout (UEFI systems)

1. Device → Create Partition Table

2. Select:

   • Partition table type: GPT
3. Apply

Step 5: Create partitions for Windows (example)

Create these in order:

Partition	Size	File system	Purpose
EFI System Partition	300–500 MB	FAT32	UEFI boot
Microsoft Reserved	16 MB	unformatted	Windows internal
Windows (C:)	Remaining	NTFS	Windows install

Important

• Set EFI partition flags: esp, boot

Step 6: Apply changes and close GParted

Now start the Windows installer — it will reuse these partitions。

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Method 2: Use parted / diskpart-style CLI (Precise)

Best if you want full control and no GUI。

Step 1: Identify disk

lsblk

Look for something like:

nvme0n1   476G

Step 2: Enter parted

sudo parted /dev/nvme0n1

Step 3: Create GPT

mklabel gpt

Step 4: Create EFI partition

mkpart EFI fat32 1MiB 501MiB
set 1 esp on

Step 5: Create Windows partition

mkpart Windows ntfs 501MiB 100%

Step 6: Exit

quit

Step 7: Format partitions

sudo mkfs.fat -F32 /dev/nvme0n1p1
sudo mkfs.ntfs -f /dev/nvme0n1p2

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Method 3: Let Ubuntu Installer Prepare the Disk (Fastest)

If you don’t care about fine control:

1. Start Ubuntu installer
2. Choose Something else
3. Select the disk

4. Create:

   • EFI partition (FAT32, mount /boot/efi)
   • Root / (ext4) or leave free space for Windows
5. Apply

Then later Windows installer can take remaining free space。

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Important Notes for Dual-Boot / Windows Install

• Always use GPT + UEFI
• Disable Fast Boot in BIOS
• Secure Boot can stay ON for Ubuntu + Windows

• Windows prefers:

  • EFI at the start of disk
  • Unallocated space (best)

If your goal is Windows-only，the cleanest is:

sudo parted /dev/nvme0n1 mklabel gpt

…and leave the disk empty。Windows installer will create everything。

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Recommendation for Your Case (Lenovo + Windows)

Since your BIOS is already AHCI:

Best option

1. From Ubuntu:

   sudo parted /dev/nvme0n1 mklabel gpt
   

2. Shut down
3. Boot Windows USB
4. Select Unallocated Space
5. Install

Zero drivers. Zero issues.

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If you want, tell me:

• Windows only or dual-boot?
• NVMe disk size
• Ubuntu version

I can give you an exact partition layout tailored to your setup.

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