I was asked in #debian-boot for the output of efibootmgr -v:
BootCurrent: 0007
Timeout: 0 seconds
BootOrder: 0001,0002,0003,0004,0005,0007
Boot0000*
ubuntu HD(1,GPT,54fdc960-7b34-4ff5-a95f-83dd7a4d6ab3,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0001* Diskette Drive BBS(Floppy,Diskette Drive,0x0)..BO
Boot0002* M.2 PCIe SSD BBS(HD,Micron 2200S NVMe 256GB ,0x0)..BO
Boot0003* USB Storage Device BBS(USB,USB Storage Device,0x0)..BO
Boot0004* CD/DVD/CD-RW Drive BBS(CDROM,CD/DVD/CD-RW Drive,0x0)..BO
Boot0005* Onboard NIC BBS(Network,IBA CL Slot 00FE v0110,0x0)..BO
Boot0006* Windows Boot
Manager HD(2,GPT,8f2f7ac4-db5d-4a70-95ed-f086712eb7a0,0x109000,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}....................
Boot0007*
debian PciRoot(0x0)/Pci(0x1d,0x0)/Pci(0x0,0x0)/NVMe(0x1,00-A0-75-01-25-65-56-7E)/HD(1,GPT,86047261-ce5a-40e9-841e-d8ae32870d9a,0x800,0x100000)/File(\EFI\debian\grubx64.efi)
Boot0008*
debian HD(1,GPT,86047261-ce5a-40e9-841e-d8ae32870d9a,0x800,0x100000)/File(\EFI\debian\shimx64.efi)
I, uh, don't have a great explanation for how that weird list of
entries came to be- other than the drive probably had Windows on it
originally, and then it had Mint on it when I got my hands on it (which
would've used ubuntu kernels/shims/whatever), and then I've installed
debian bookworm twice on it so far? But honestly, who knows. *shrug*