For experts, here is the info file generated by boot-repair:
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boot-repair-4ppa125 [20201006_2250]
============================== Boot Info Summary ===============================
=> Windows 7/8/2012 is installed in the MBR of /dev/sda.
=> No boot loader is installed in the MBR of /dev/sdb.
sda1: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows 7/2008: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files:
sdb1: __________________________________________________________________________
File system: vfat
Boot sector type: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /efi/BOOT/bkpbootx64.efi /efi/BOOT/bootx64.efi
/efi/BOOT/fbx64.efi /efi/BOOT/grubx64.efi
/efi/BOOT/mmx64.efi /efi/ubuntu/grubx64.efi
/efi/ubuntu/mmx64.efi /efi/ubuntu/shimx64.efi
/efi/ubuntu/grub.cfg
sdb2: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 20.04.1 LTS
Boot files: /boot/grub/grub.cfg /etc/fstab /etc/default/grub
================================ 1 OS detected =================================
OS#1: The currently used OS - Ubuntu 20.04.1 LTS CurrentSession on sdb2
============================ Architecture/Host Info ============================
CPU architecture: 64-bit
BOOT_IMAGE of the installed session in use:
/boot/vmlinuz-5.4.0-48-generic root=UUID=586e3e66-e7ca-4710-a440-85b3d5e92e5c ro quiet splash vt.handoff=7
===================================== UEFI =====================================
BIOS is EFI-compatible, and is setup in EFI-mode for this installed-session.
SecureBoot disabled.
efibootmgr -v
BootCurrent: 0002
Timeout: 1 seconds
BootOrder: 0002,0000
Boot0000* Windows Boot Manager VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)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.}...r................
Boot0002* ubuntu HD(1,GPT,b9a01cb1-5a09-4fba-b304-838057fe64e5,0x800,0x100000)/File(\EFI\UBUNTU\SHIMX64.EFI)
78415fb8fb9b909f8029858113f1335f sdb1/BOOT/bkpbootx64.efi
78415fb8fb9b909f8029858113f1335f sdb1/BOOT/bootx64.efi
2895d47544fd587b26c7e29be1295c27 sdb1/BOOT/fbx64.efi
114bd85eec32e3162958ea034020821d sdb1/BOOT/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84 sdb1/BOOT/mmx64.efi
114bd85eec32e3162958ea034020821d sdb1/ubuntu/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84 sdb1/ubuntu/mmx64.efi
78415fb8fb9b909f8029858113f1335f sdb1/ubuntu/shimx64.efi
============================= Drive/Partition Info =============================
Disks info: ____________________________________________________________________
sdb : is-GPT, no-BIOSboot, has---ESP, not-usb, not-mmc, has-os, 2048 sectors * 512 bytes
sda : notGPT, no-BIOSboot, has-noESP, not-usb, not-mmc, no-os, 2048 sectors * 512 bytes
Partitions info (1/3): _________________________________________________________
sdb2 : is-os, 64, apt-get, signed grub-pc grub-efi , grub2, grub-install, grubenv-ok, update-grub, farbios
sda1 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, farbios
sdb1 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, not-far
Partitions info (2/3): _________________________________________________________
sdb2 : isnotESP, fstab-has-goodEFI, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
sda1 : isnotESP, part-has-no-fstab, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
sdb1 : is---ESP, part-has-no-fstab, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
Partitions info (3/3): _________________________________________________________
sdb2 : not-sepboot, with-boot, fstab-without-boot, not-sep-usr, with--usr, fstab-without-usr, std-grub.d, sdb
sda1 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sdb1 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sdb
fdisk -l (filtered): ___________________________________________________________
Disk sda: 119.25 GiB, 128035676160 bytes, 250069680 sectors
Disk identifier: 0x7d5ab7ee
Boot Start End Sectors Size Id Type
sda1 2048 250066943 250064896 119.2G 7 HPFS/NTFS/exFAT
Disk sdb: 238.49 GiB, 256060514304 bytes, 500118192 sectors
Disk identifier: 3C572E11-3E7D-4645-AD47-C8598395CB0F
Start End Sectors Size Type
sdb1 2048 1050623 1048576 512M EFI System
sdb2 1050624 500117503 499066880 238G Linux filesystem
parted -lm (filtered): _________________________________________________________
sda:128GB:scsi:512:512:msdos:ATA SanDisk SDSSDHP1:;
1:1049kB:128GB:128GB:ntfs::;
sdb:256GB:scsi:512:512:gpt:ATA LITEON S960 256:;
1:1049kB:538MB:537MB:fat32:EFI System Partition:boot, esp;
2:538MB:256GB:256GB:ext4::;
blkid (filtered): ______________________________________________________________
NAME FSTYPE UUID PARTUUID LABEL PARTLABEL
sda
└─sda1 ntfs 2A1A02001A01C9B1 7d5ab7ee-01 DATA ALEC
sdb
├─sdb1 vfat 1B01-4E39 b9a01cb1-5a09-4fba-b304-838057fe64e5 EFI System Partition
└─sdb2 ext4 586e3e66-e7ca-4710-a440-85b3d5e92e5c 58714ace-ff47-46c7-b140-7eec8f49c0c6
df (filtered): _________________________________________________________________
Available Use% Mounted on
sda1 44.3G 63% /mnt/2A1A02001A01C9B1
sdb2 167G 23% /
Mount options: __________________________________________________________________
sda1 rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdb2 rw,relatime,errors=remount-ro
===================== sdb1/efi/ubuntu/grub.cfg (filtered) ======================
search.fs_uuid 586e3e66-e7ca-4710-a440-85b3d5e92e5c root hd1,gpt2
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg
====================== sdb2/boot/grub/grub.cfg (filtered) ======================
Ubuntu 586e3e66-e7ca-4710-a440-85b3d5e92e5c
Ubuntu, with Linux 5.4.0-48-generic 586e3e66-e7ca-4710-a440-85b3d5e92e5c
Ubuntu, with Linux 5.4.0-47-generic 586e3e66-e7ca-4710-a440-85b3d5e92e5c
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###
========================== sdb2/etc/fstab (filtered) ===========================
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda2 during installation
UUID=586e3e66-e7ca-4710-a440-85b3d5e92e5c / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
/swapfile none swap sw 0 0
/dev/disk/by-uuid/2A1A02001A01C9B1 /mnt/2A1A02001A01C9B1 auto nosuid,nodev,nofail,x-gvfs-show 0 0
UUID=1B01-4E39 /boot/efi vfat defaults 0 1
======================= sdb2/etc/default/grub (filtered) =======================
GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 5.4.0-47-generic"
GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="10"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_SAVEDEFAULT="false"
==================== sdb2: Location of files loaded by Grub ====================
GiB - GB File Fragment(s)
215.131843567 = 230.996058112 boot/grub/grub.cfg 1
141.902477264 = 152.366624768 boot/vmlinuz 1
131.355594635 = 141.041995776 boot/vmlinuz-5.4.0-47-generic 1
141.902477264 = 152.366624768 boot/vmlinuz-5.4.0-48-generic 1
131.355594635 = 141.041995776 boot/vmlinuz.old 1
130.984321594 = 140.643344384 boot/initrd.img 4
10.203346252 = 10.955759616 boot/initrd.img-5.4.0-47-generic 2
130.984321594 = 140.643344384 boot/initrd.img-5.4.0-48-generic 4
10.203346252 = 10.955759616 boot/initrd.img.old 2
===================== sdb2: ls -l /etc/grub.d/ (filtered) ======================
-rwxr-xr-x 1 root root 17622 August 17 16:04 10_linux
-rwxr-xr-x 1 root root 42359 August 17 16:04 10_linux_zfs
-rwxr-xr-x 1 root root 12894 July 31 02:34 20_linux_xen
-rwxr-xr-x 1 root root 12059 July 31 02:34 30_os-prober
-rwxr-xr-x 1 root root 1424 July 31 02:34 30_uefi-firmware
-rwxr-xr-x 1 root root 214 July 31 02:34 40_custom
-rwxr-xr-x 1 root root 216 July 31 02:34 41_custom
drwxr-xr-x 4 root root 4096 October 6 22:16 backup
Suggested repair: ______________________________________________________________
The default repair of the Boot-Repair utility would reinstall the grub-efi-amd64-signed of
sdb2,
using the following options: sdb1/boot/efi,
Additional repair would be performed: unhide-bootmenu-10s use-standard-efi-file restore-efi-backups
Final advice in case of suggested repair: ______________________________________
Please do not forget to make your UEFI firmware boot on the currently used OS - Ubuntu 20.04.1 LTS CurrentSession entry (sdb1/efi/****/shim****.efi (**** will be updated in the final message) file)!
