It seems it ignores your mountpoint, you pass directly the hard disk and
EFI partition number (which should be the first) so in:
efibootmgr -v -c -u -L Qubes -l /EFI/qubes/xen.efi -d /dev/sda -p 1
"placeholder /mapbs /noexitboot"

You only have to worry about /dev/sda
-----------------------------
Thank you very much Donoban. I tried:
root@debian:~# efibootmgr -v -c -u -L Qubes -l /EFI/qubes/xen.efi -d
/dev/nvme0n1 -p 1 "placeholder /mapbs /noexitboot"
efibootmgr: ** Warning ** : Boot0002 has same label Qubes
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0000,0001
Boot0001* UEFI: KingstonDataTraveler 2.0PMAP, Partition 1
  PciRoot(0x0)/Pci(0x14,0x0)/USB(8,0)/HD(1,MBR,0x51f9fa69,0x630,0x1700)
Boot0002* Qubes
  
HD(1,GPT,13cfa870-22a0-4035-8a48-d3cb09dcfb92,0x800,0x64000)/File(\EFI\qubes\xen.efi)placeholder
 /mapbs /noexitboot
Boot0006* CD/DVD/CD-RW Drive    BBS(CDROM,CD/DVD/CD-RW Drive,0x0)
Boot0007* Onboard NIC    BBS(Network,IBA CL Slot 00FE v0112,0x0)
Boot0000* Qubes
  
HD(1,GPT,13cfa870-22a0-4035-8a48-d3cb09dcfb92,0x800,0x64000)/File(\EFI\qubes\xen.efi)placeholder
 /mapbs /noexitboot
what you see is that Qubes was still in the UEFI "line" now at position
0002. I will have to try a reboot - don't like it, because it is a pain
in the neck to re-install wireless on debian; I hope that I downloaded
all packages I need on /boot of my life system ... otherwise I will
become silent for a while!    Cheers

I tried a reboot after an extra-emergeny backup (luks-by-hand training:)
and your efibootmgr command worked. qubes is back!  Thank you so much.

Bernhard

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