Unknowingly fxking windows 10 has tampered with my boot/grub configuration in the background during the 'windows update cycle'. Grub is no longer accessible/visible during the normal boot.
efibootmgr -v yields:
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BootOrder: 0009,0007,0008,0006,0000
Boot0000* Windows Boot Manager HD(2,GPT,1a9f20ea-4510-4366-a7b0-933a939bf949,0xe1800,0x32000)/File(\EFI\debian\grubx64.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.}...I................
Boot0006* Windows Boot Manager HD(2,GPT,1a9f20ea-4510-4366-a7b0-933a939bf949,0xe1800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)
Boot0007* Windows Boot Manager HD(4,GPT,b9a0ae4c-c341-4024-9481-bf920d130a4c,0x11b800,0x679ef8f)/File(\EFI\Boot\bootx64.efi)
Boot0008* Windows Boot Manager HD(4,GPT,b9a0ae4c-c341-4024-9481-bf920d130a4c,0x11b800,0x666fb46)/File(\EFI\Boot\bootx64.efi)
Boot0009* UEFI: Sony Storage Media PMAP PciRoot(0x0)/Pci(0x1d,0x0)/USB(1,0)/USB(1,0)/HD(1,GPT,eb0ef56a-4816-4dd1-9067-dfd783891989,0x800,0x301f)..BO
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mount /dev/sda1 /boot/efi
apt-get install --reinstall grub-efi
grub-install /dev/sda
Installing for x86_64-efi platform.
grub-install: error: /boot/efi doesn't look like an EFI partition.
Thank you.