Guest migration (Linux) from Hyper-v Gen2 to Proxmox VE 5, how?

Question

linux

Good day.
How is it possible to migrate from Hyper-V Gen2 guest Linux (Ubuntu) to Proxmox VE (version 5) ?
According to the "manuals" on the Internet, it seems not difficult.
1. Create a VM with the same configuration as in Hyper-V
2. Transfer the disk to the server with Proxmox.
3. Import the disk in one of these ways:
qemu-img convert -O qcow2 Open.vhdx /vm/images/100/vm-100-disk-0.qcow2
qm importdisk 100 /home/user/Open.vhdx vm_local --format qcow2

4. Start the VM.
After that, the VM does not start:
Image on the screen:
booting hard disk ...

I tried to change the controller, set LSI and SCSI by default. Different type of interface on the disk IDE, SCSI, Virtio - all without success.
Converted by the disk2vhd utility to vhd from the original vhdx format - without result. Also converted to vhd directly from powershell.
Generation on hyper-v is the second, so by default there is EFI. If you select EFI in Proxmox, it also does not work.
Here are the hara-ki from HV

Suspicion of GPT partitions of the disk, who came across, I ask for advice / help. How can I import a virtual machine?
Here are the links that I used:
1 , 2
Well, the proxy forum.
Thanks to everyone who will respond.

Answer 1

Try the converter from Starwind

Answer 2

In the bootloader and fstab settings, specify the correct UUIDs of the partitions or the devices themselves.

Answer 3

make an image from the guest via dd to a network share, and then deploy to proxmox from under any livecd and update the bootloader.

Answer 4

Don't worry, just migrate rsincom skipping system things, the easiest and most effective method

Answer 5

It was solved by changing efi to bios and installing / updating the bootloader.