Creating a dual boot environment for Ubuntu Server 20.04.1 LTS and Windows 10

0.Intro Basically, you can follow this procedure. [Dual Boot Ubuntu Server 20.04 LTS and Windows 10 - A Step by Step Install Guide - (UEFI Tutorial)] https://www.youtube.com/watch?v=yJeDV34GzqI However, since I started from a place without the idea of ​​GPT, it was difficult to get like this video. I did a lot of research and arrived at the Powershell command MBR2GPT, but that didn't work either. After all, it was a new PC, so I started by reinstalling Windows.

As a point to note before work, other articles on dual booting Ubuntu and Windows also point out,

1. Turn off Windows fast startup
2. It is better to remove other than the target storage.
3. It may be better to turn off the CSM.
4. It may be better to turn off Secure Boot as well. is.

[Target machine configuration] [Model name] GALLERIA ZZ [Graphics] NVIDIA GeForce RTX 2080 Ti 【CPU】Intel Core i9-9900K 3.60GHz [Memory] 128GB [Storage] SSD 1TB + HDD 4TB 【MB】Asrock z390 phantom gaming 4 [Optical drive] BD-RE 【LAN】Gigabit LAN

1. Main paper

[Windows10] First, perform GPT conversion of storage.

1. Launch with the installation media. (I was a DVD)

2. Select "Repair your computer".

3. Select "Troubleshooting".

4. Select "Command Prompt".

5. Work the following with diskpart (Display the disc list) list disk (Select the disk you want to install) select disk 0 (Clear all) clean (Perform GPT format) convert gpt

6. Exit diskpart and reboot.

7. Install normally from the installation media.

8. Set up and start.

9. Confirm that it is "GUID Partition Table (GPT)" in Disk Management.

I think there is also a 100M EFI system partition. 10. Reduce the area of ​​Windows by the area you want to allocate to Ubuntu. 11. Create a "new simple volume" in the generated unallocated space. At this time, no drive letter is assigned. No formatting required. 12. Exit Windows.

[Ubuntu Server 20.04.1 LTS] I also installed it from the DVD. As a procedure, install normally until just before [Guided storage configuration]. When you reach the Guided storage configuration Select Custom storage layout Select the volume created in "New Simple Volume" earlier. Select ext4 as format in Edit. I think the mount will be selected automatically, but select "/". If you select it, the Windows UEFI boot area will be automatically selected at the same time as the one you just selected, and you will see two lines.

The rest is the normal installation procedure.

I think that it is ready for dual booting. The boot order is UEFI as you like.

2. Appendix

It became possible to dual boot, but the screen display of Ubuntu became distorted unless it was a safe graphic. Why is this? .. .. It's not a big problem, so we will deal with it appropriately. Since it is Ubuntu Server in the first place, the screen display does not matter w

I'm sorry that there are few captures because it is not a work that can be done many times. I hope it will be of some help.