I have 2 hard drives on my computer. Have Ubuntu 22.04 on one for a long time. Yesterday I installed NixOS on the other and now can no longer boot into Ubuntu even when I disconnect the drive with NixOS on it.
I ran boot repair (log below). It did not offer an option to fix things as I have seen it do in the past.
boot-repair-4ppa203 [20230113_1752]
============================== Boot Info Summary ===============================
nvme0n1: _______________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 22.04.1 LTS
Boot files: /boot/grub/grub.cfg /etc/fstab /etc/default/grub
sdb: ___________________________________________________________________________
File system: iso9660
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: /mnt/BootInfo/FD/sdb: /dev/sdb already mounted or mount point busy.
================================ 0 OS detected =================================
================================ Host/Hardware =================================
CPU architecture: 64-bit
Video: GM107 [GeForce GTX 750 Ti] HD Graphics 530 from NVIDIA Corporation Intel Corporation
Live-session OS is Ubuntu 64-bit (Ubuntu 20.04.5 LTS, focal, x86_64)
===================================== UEFI =====================================
BIOS/UEFI firmware: 1.1.12(1.1) from Dell Inc.
The firmware is EFI-compatible, and is set in EFI-mode for this live-session.
SecureBoot disabled (confirmed by mokutil).
BootCurrent: 1006
Timeout: 1 seconds
BootOrder: 0002,0000,0001,0003,0004,0005
Boot0000 ubuntu VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)
Boot0001 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.}...d................
Boot0002* grub.efi VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)
Boot0003 Onboard NIC (IPV4) PciRoot(0x0)/Pci(0x1c,0x3)/Pci(0x0,0x0)/MAC(f48e38d7cb84,0)/IPv4(0.0.0.00.0.0.0,0,0)..BO
Boot0004 Onboard NIC (IPV6) PciRoot(0x0)/Pci(0x1c,0x3)/Pci(0x0,0x0)/MAC(f48e38d7cb84,0)/IPv6([::]:<->[::]:,0,0)..BO
Boot0005 Linux Boot Manager VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)
============================= Drive/Partition Info =============================
Disks info: ____________________________________________________________________
nvme0n1 : notGPT, no-BIOSboot, has-noESP, not-usb, not-mmc, no-os, no-wind, 2048 sectors * 512 bytes
Partitions info (1/3): _________________________________________________________
Partitions info (2/3): _________________________________________________________
Partitions info (3/3): _________________________________________________________
fdisk -l (filtered): ___________________________________________________________
Disk nvme0n1: 465.78 GiB, 500107862016 bytes, 976773168 sectors
Disk sdb: 29.84 GiB, 32015679488 bytes, 62530624 sectors
Disk identifier: 0x105b854a
Boot Start End Sectors Size Id Type
sdb1 * 0 7547231 7547232 3.6G 0 Empty
sdb2 566648 574647 8000 3.9M ef EFI (FAT-12/16/32)
sdb3 7548928 62530623 54981696 26.2G 83 Linux
parted -lm (filtered): _________________________________________________________
sdb:32.0GB:scsi:512:512:unknown:SanDisk Cruzer Fit:;
nvme0n1:500GB:nvme:512:512:loop:CT500P3SSD8:;
1:0.00B:500GB:500GB:ext4::;
blkid (filtered): ______________________________________________________________
NAME FSTYPE UUID PARTUUID LABEL PARTLABEL
sdb iso9660 2022-08-31-07-21-46-00 Ubuntu 20.04.5 LTS amd64
├─sdb1 iso9660 2022-08-31-07-21-46-00 105b854a-01 Ubuntu 20.04.5 LTS amd64
├─sdb2 vfat 54C5-9C6C 105b854a-02
└─sdb3 ext4 e3949b82-bd59-4957-adf1-c8320d7dd2cc 105b854a-03 writable
nvme0n1 ext4 3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba
Mount points (filtered): _______________________________________________________
Avail Use% Mounted on
/dev/disk/by-label/writable[/install-logs-2023-01-13.0/crash] 24.3G 0% /var/crash
/dev/disk/by-label/writable[/install-logs-2023-01-13.0/log] 24.3G 0% /var/log
/dev/nvme0n1 178.6G 56% /media/ubuntu/3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba
/dev/sdb1 0 100% /cdrom
Mount options (filtered): ______________________________________________________
==================== nvme0n1/boot/grub/grub.cfg (filtered) =====================
Ubuntu 3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba
Ubuntu, with Linux 5.15.0-57-generic 3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba
Ubuntu, with Linux 5.15.0-56-generic 3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba
Ubuntu 22.04 LTS (22.04) (on sdc2) 6c923416-303e-4ddb-8a4a-634146d057ef
Ubuntu (on sdc2) 6c923416-303e-4ddb-8a4a-634146d057ef
Ubuntu, with Linux 5.15.0-41-generic (on sdc2) 6c923416-303e-4ddb-8a4a-634146d057ef
Ubuntu, with Linux 5.15.0-40-generic (on sdc2) 6c923416-303e-4ddb-8a4a-634146d057ef
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###
========================= nvme0n1/etc/fstab (filtered) =========================
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/nvme0n1 during installation
UUID=3cfa2ac8-eb84-4a94-9eae-ef4957bdeeba / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=BA32-17B7 /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
===================== nvme0n1/etc/default/grub (filtered) ======================
GRUB_DEFAULT=0
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=""
================== nvme0n1: Location of files loaded by Grub ===================
GiB - GB File Fragment(s)
293.740905762 = 315.401895936 boot/grub/grub.cfg 1
324.292003632 = 348.205887488 boot/vmlinuz 2
220.424819946 = 236.679348224 boot/vmlinuz-5.15.0-56-generic 1
324.292003632 = 348.205887488 boot/vmlinuz-5.15.0-57-generic 2
220.424819946 = 236.679348224 boot/vmlinuz.old 1
257.949718475 = 276.971401216 boot/initrd.img 1
259.574714661 = 278.716227584 boot/initrd.img-5.15.0-56-generic 1
257.949718475 = 276.971401216 boot/initrd.img-5.15.0-57-generic 1
259.574714661 = 278.716227584 boot/initrd.img.old 1
==================== nvme0n1: ls -l /etc/grub.d/ (filtered) ====================
-rwxr-xr-x 1 root root 18683 Apr 15 2022 10_linux
-rwxr-xr-x 1 root root 43031 Apr 15 2022 10_linux_zfs
-rwxr-xr-x 1 root root 14180 Apr 15 2022 20_linux_xen
-rwxr-xr-x 1 root root 13369 Apr 15 2022 30_os-prober
-rwxr-xr-x 1 root root 1372 Apr 15 2022 30_uefi-firmware
-rwxr-xr-x 1 root root 700 Feb 19 2022 35_fwupd
-rwxr-xr-x 1 root root 214 Apr 15 2022 40_custom
-rwxr-xr-x 1 root root 215 Apr 15 2022 41_custom
======================== Unknown MBRs/Boot Sectors/etc =========================
Unknown BootLoader on sdb
Suggested repair: ______________________________________________________________
The default repair of the Boot-Repair utility would not act on the boot.
