1/ efibootmgr du serveur en question (Ubuntu 18.04 est le seul système d'exploitation et Windows n'a jamais été installé sur ce serveur)
# efibootmgr -v
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0004,0000,0002,0003,0005
Boot0000* Windows Boot Manager HD(1,GPT,0bb8261c-af59-11e2-ad71-d829a5f6482d,0x800,0x32000)/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.}...a................
Boot0002* EFI Network 1 PcieRoot(0x0)/Pci(0x1c,0x4)/Pci(0x0,0x0)/MAC(90b11c522ca3,0)/IPv4(0.0.0.00.0.0.0,0,0)
Boot0003* EFI Network 2 PcieRoot(0x0)/Pci(0x1c,0x4)/Pci(0x0,0x1)/MAC(90b11c522ca4,0)/IPv4(0.0.0.00.0.0.0,0,0)
Boot0004* Windows Boot Manager HD(1,GPT,b221b9be-a399-11d5-a392-d4ae5290fd14,0x800,0x32000)/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.}...a................
Boot0005* EFI Fixed Disk Boot Device 1 PcieRoot(0x0)/Pci(0x1f,0x2)/Sata(0,0,0)/HD(1,GPT,c188b9a0-7588-4e8c-a27b-c87039655832,0x800,0x100000)
Il manque l'entrée Boot0001* ubuntu donc en cas de reboot je perds le serveur.
2/ Pour comparer, efibootmgr d'un autre serveur Dell sous Ubuntu 18.04 (c'est fr.archive.ubuntu.com, qui est sur un serveur plus récent, un Dell PowerEdge R330, avec une carte Raid hardware)
# efibootmgr -v
BootCurrent: 0000
BootOrder: 0000
Boot0000* ubuntu HD(1,GPT,ef7f70c3-e783-4816-b9a9-b1c51a4990ad,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
3/ efibootmgr d'un autre serveur chez Ikoula, avec Ubuntu 16.04 :
# efibootmgr -v
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0003,0002
Boot0000* ubuntu HD(1,GPT,414437d4-e240-4c0c-b19c-36934e5685a5,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0002* Hard Drive BBS(HD,,0x0)AMGOAMNO........o.K.I.N.G.S.T.O.N. .S.K.C.1.0.0.S.3.1.2.0.G....................A...........................>..Gd-.;.A..MQ..L.0.5.2.0.B.6.2.7.C.2.5.0.A.C.6.5. . . . ......AMBO
Boot0003* Network Card BBS(Network,,0x0)AMGOAMNO........k.R.e.a.l.t.e.k. .P.X.E. .B.0.2. .D.0.0.........................rN.D+..,.\...........<..Gd-.;.A..MQ..L.R.e.a.l.t.e.k. .P.X.E. .B.0.2. .D.0.0......AMBO
4/ efibootmgr d'un serveur sous Ubuntu 16.04 (Dell PowerEdge R210 II sans carte Raid hardware)
# efibootmgr -v
BootCurrent: 0001
Timeout: 2 seconds
BootOrder: 0001,0003,0002
Boot0000* Harddisk: Samsung SSD 850 PRO 512GB BBS(HD,Harddisk: Samsung SSD 850 PRO 512GB ,0x500)................-...........A..........................................
Boot0001* ubuntu HD(1,GPT,646928cf-2f89-4d13-983a-5e68a6ac153a,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0002* lafibre.info PciRoot(0x0)/Pci(0x1f,0x2)/Sata(0,0,0)/HD(1,GPT,646928cf-2f89-4d13-983a-5e68a6ac153a,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0003 Windows Boot Manager HD(2,GPT,5e4900cd-957f-438d-a111-06ac2d9d1ed8,0xe1800,0x32000)/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.}....................
5/ efibootmgr d'un autre serveur Dell PowerEdge R210 II sans carte Raid hardware, mais sous Ubuntu 18.04 :
# efibootmgr -v
BootCurrent: 0000
Timeout: 2 seconds
BootOrder: 0000,0003,0002
Boot0000* ubuntu HD(1,GPT,fc3270e4-c4f4-45a1-b964-1ad644a94d01,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0001* Harddisk: Samsung SSD 850 EVO 250GB BBS(HD,Harddisk: Samsung SSD 850 EVO 250GB ,0x500)................-...........A..........................................
Boot0002* EFI Fixed Disk Boot Device 1 PciRoot(0x0)/Pci(0x1f,0x2)/Sata(0,0,0)/HD(1,GPT,fc3270e4-c4f4-45a1-b964-1ad644a94d01,0x800,0x100000)
Boot0003* Windows Boot Manager HD(1,GPT,ebe27218-7b17-4fd1-a701-b76c33b9e781,0x800,0x32000)/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.}...a................
6/ Serveur de test Dell PowerEdge R210 II :
# efibootmgr -v
BootCurrent: 0002
Timeout: 2 seconds
BootOrder: 0002,0005,0004,0000
Boot0000* ubuntu PciRoot(0x0)/Pci(0x1f,0x2)/Sata(0,0,0)/HD(1,GPT,86cfd122-2e75-4209-ad84-8e077946e111,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0001* Harddisk: WDC WD5003ABYX-18WERA0 BBS(HD,Harddisk: WDC WD5003ABYX-18WERA0 ,0x500)................-...........A..........................................
Boot0002* ubuntu HD(1,GPT,86cfd122-2e75-4209-ad84-8e077946e111,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0003* BEV device: Slot 1 NIC: IBA XE Slot 0100 v2202 BBS(128,BEV device: Slot 1 NIC: IBA XE Slot 0100 v2202,0x0).......................................................................
Boot0004* EFI Fixed Disk Boot Device 1 PciRoot(0x0)/Pci(0x1f,0x2)/Sata(0,0,0)/HD(1,GPT,86cfd122-2e75-4209-ad84-8e077946e111,0x800,0x100000)
Boot0005* Windows Boot Manager HD(1,GPT,61f605be-4825-44ed-b69b-87fcf1fdee81,0x800,0x100000)/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.}...a................
7/ PC grand public avec Windows 10 et Ubuntu 18.04 en dual boot : (PC de bureau Dell Inspiron 3650 - génération Skylake - Core i3 6100 équipé d'un chipset Intel H110)
$ efibootmgr -v
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0001,0000,0002,0008
Boot0000* Windows Boot Manager HD(2,GPT,55c63364-ac29-42ed-92dc-c8a0bc9ab9e1,0xe1800,0x32000)/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.}...,................
Boot0001* ubuntu HD(2,GPT,55c63364-ac29-42ed-92dc-c8a0bc9ab9e1,0xe1800,0x32000)/File(\EFI\ubuntu\shimx64.efi)
Boot0002* Onboard NIC (IPV4) PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(484d7e994ad4,0)/IPv4(0.0.0.00.0.0.0,0,0)..BO
Boot0008* Onboard NIC (IPV6) PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(484d7e994ad4,0)/IPv6([::]:<->[::]:,0,0)..BO