Guys, I've already found the solution.
1) Install the system in UEFI mode. 
2) When an error appears, you should reboot and click F9 button.
3) Boot from EFI file -> first line -> BOOT -> bootx64.efi
4) System will boot normally. Then Ctrl+Alt+T and type: sudo update-grub2
5) That's all!
Thanks to my friend Ivan Fonariov!

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https://bugs.launchpad.net/bugs/1835664

Title:
  I can not install any Ubuntu distros in the UEFI mode (but BIOS-
  compability mode works without efforts): "Unable to install GRUB in
  /dev/sda"

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