Qubes OS 4.1.1 does not boot after installation. Before installation I cleared GPT and MBR with gdisk from bootable ubuntu stick, then installed from bootable stick created by Rufus in dd mode. Chosen auto disk partitioning.
BIOS just shows screen with asking boot device endlessly. Secure boot is disabled.
What should I check first?
Try booting the Ubuntu stick and run:
ls /sys/firmware/efi
If you see some files, then try:
sudo gdisk -l /dev/sda
and look for EFI System Partition – if it is eg. 1, then you can try:
efibootmgr -v -c -u -L QUBES -l /EFI/qubes/grubx64.efi -d /dev/sda -p 1
… and if your disk is named /dev/nvme0n1 replace sda accordingly. 
Credits go to: