New computer with Intel Comet Lake CPU and Kingston A2000 NVMe disk - question about compatibility with Ubuntu 20.04 LTS

I suggest you contact Kingston as well. Make sure you have the latest BIOS in the motherboard and firmware in the drive itself.

I asked Kingston but they suggested me to contact with linux community so I think that they don't want help me.

On the Internet I found that I should add flag onto boot in the grub file "nvme_core.default_ps_max_latency_us=5500". The question is how I can do this and what I should do to edit GRUB because I think that I will be must add this flag to every boot my system. I would like to add this flag one time and have calm.

see https://help.ubuntu.com/community/BootOptions#Changing_the_CD_Boot_Option_Configuration_Line

When starting the installation press F6 and add

nvme_core.default_ps_max_latency_us=5500 -- nvme_core.default_ps_max_latency_us=5500

to the command line.
The first part is valid for booting the installer, and the text after the "--" will be added to the boot line of the installed system.

Thank you Manfred Hampl for answer. My english is not best but if I will install my Ubuntu with this flag in next boot this will be added to GRUB file automatically or I will must always add this in every boot?

When you enter this at the moment when you install Ubuntu, then it will be added to the GRUB file automatically and will be always valid.

When you have already installed the system, then you have to do something different.

https://askubuntu.com/questions/19486/how-do-i-add-a-kernel-boot-parameter

Second question to installation. I heard that for UEFI I should add /boot/efi to installation process? GRUB file I also should install to /boot or installed will do automatically? Of course I want to install with manual option, not automatic process.

"Of course I want to install with manual option, not automatic process."

Why? Do you think that you know better than the developers ho have set up the logic for automatic installation?

Of course the answer is yes. Developer doesn't know where I have files, what size of partition I want to have. I want to do own partition size. Why? Because I always do manual installation option and this is the best for me.

If you know better than the developers, why do you then think that we can help you?
I do not know better than the developers.

So you didn't install anytime with manual partitioning option? This option added developers so this is possible to install it. I always do it for MBR partition and old BIOS. I want to do also for UEFI. If you don't want help I will understand this. I will find help in other place.

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