also ich bin grad auf dein link gegangen und das testen ergab das hier
root@lubuntu:/home/lubuntu# mount | grep efivars
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
und das hab ich eben getestet
root@lubuntu:/home/lubuntu# efibootmgr -v
BootCurrent: 0005
Timeout: 0 seconds
BootOrder: 2002,0004,0001,0000,2003,2001
Boot0000* Ubuntu HD(2,e1800,82000,27a2a898-01bc-11e2-b63f-bac31b848a9a)File(\EFI\ubuntu\grubx64.efi)RC
Boot0001* ubuntu HD(2,e1800,82000,27a2a898-01bc-11e2-b63f-bac31b848a9a)File(\EFI\ubuntu\shimx64.efi)
Boot0002* EFI Network 0 for IPv6 (70-54-D2-0C-9A-31) ACPI(a0341d0,0)PCI(15,2)PCI(0,0)MAC(MAC(7054d20c9a31,0)030d3c000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000RC
Boot0003* EFI Network 0 for IPv4 (70-54-D2-0C-9A-31) ACPI(a0341d0,0)PCI(15,2)PCI(0,0)MAC(MAC(7054d20c9a31,0)RC
Boot0004* Windows Boot Manager HD(2,e1800,82000,27a2a898-01bc-11e2-b63f-bac31b848a9a)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.}...f................
Boot0005* EFI DVD/CDROM (TSSTcorp CDDVDW SN-208AB) ACPI(a0341d0,0)PCI(11,0)ATAPI(1,0,0)CD-ROM(1,50cf7,11c0)RC
Boot2001* EFI USB-Laufwerk RC
Boot2002* EFI DVD/CDROM RC
Boot2003* EFI Network RC
also hat das was easyBCD mir angezeigt hatte doch gestimmt