I’ve followed all the suggestions I’ve found using Google including using reinstalling from Debian installer, grub-install, and Rescatux. There's 390 matches on this form to "no OS found" so I'm asking for help to narrow the search. My system will only boot from USB or SD card. Supergrub2 indicates choice of /boot/vmlinuz-6.00-4-amd64 (on hd1,gpt2, the SD card). Thanks in advance to anyone who can point me in the right direction. I know that there is a fundamental principle about boot that I'm completely missing. Probably because the installer has always solved the issue in the past so this is the first time I ever had this problem in over 10 years of using Linux.
After booting using supergrub2 on SDHC memory card (sdb) my system is as follows:
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bill@debian:/etc$ sys # alias for ‘neofetch’
_,met$$$$$gg. bill@debian
,g$$$$$$$$$$$$$$$P. -----------
,g$$P" """Y$$.". OS: Debian GNU/Linux bookworm/sid x86_64
,$$P' `$$$. Host: Lenovo H520S Lenovo Product
',$$P ,ggs. `$$b: Kernel: 6.0.0-4-amd64
`d$$' ,$P"' . $$$ Uptime: 14 hours, 21 mins
$$P d$' , $$P Packages: 2224 (dpkg)
$$: $$. - ,d$$' Shell: bash 5.2.2
$$; Y$b._ _,d$P' Resolution: 1920x1080
Y$$. `.`"Y$$$$P"' DE: Xfce 4.16
`$$b "-.__ WM: Xfwm4
`Y$$ WM Theme: Default
`Y$$. Theme: Xfce [GTK2], Adwaita [GTK3]
`$$b. Icons: Tango [GTK2], Adwaita [GTK3]
`Y$$b. Terminal: xfce4-terminal
`"Y$b._ Terminal Font: Monospace 12
`""" CPU: Intel Pentium G640 (2) @ 2.800GHz
GPU: Intel 2nd Generation Core Processor Family
Memory: 1802MiB / 3824MiB
bill@debian:/etc$ sudo fdisk -l
Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: WDC WD5000AAKX-0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 7A875DD9-06C9-4E90-9D3B-0928BA14C90E
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 974772223 973721600 464.3G Linux filesystem
/dev/sda3 974772224 976771071 1998848 976M Linux swap
Disk /dev/sdb: 1.84 GiB, 1977614336 bytes, 3862528 sectors
Disk model: STORAGE DEVICE
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6b953a68
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 6144 73728 67585 33M b W95 FAT32
/dev/sdb2 75776 618496 542721 265M c W95 FAT32 (LBA)
bill@debian:/etc$ sudo blkid
/dev/sda2: UUID="70137697-6171-4975-9585-e68ebecd5d11" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="c997e1c7-22cf-4804-8506-dc33a1f96107"
/dev/sda3: UUID="2d834e5c-177c-4f17-9e60-596ff831ec11" TYPE="swap" PARTUUID="d7826bb7-dfb3-4ed7-9b0d-73f351106b21"
/dev/sda1: UUID="1E69-139E" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="985cefed-f28a-4dbd-9055-a3ff7ed06f15"
/dev/sdb2: LABEL_FATBOOT="SG2DISOS" LABEL="SG2DISOS" UUID="B575-ABAB" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="6b953a68-02"
/dev/sdb1: LABEL_FATBOOT="SG2DBOOT" LABEL="SG2DBOOT" UUID="B5B2-9BB7" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="6b953a68-01"
bill@debian:/etc$ efibootmgr -v
BootCurrent: 0005
Timeout: 1 seconds
BootOrder: 0005,0011,000C,000F,0010
Boot0005* debian HD(1,GPT,985cefed-f28a-4dbd-9055-a3ff7ed06f15,0x800,0x100000)/File(\EFI\debian\shimx64.efi)
Boot000C* HL-DT-STDVD-RAM GH70N BBS(CDROM,,0x0)AMBO
Boot000F* WDC WD5000AAKX-083CA1 BBS(HD,,0x0)AMBO
Boot0010* Generic STORAGE DEVICE 9843 BBS(HD,,0x0)AMBO
Boot0011* UEFI: Generic STORAGE DEVICE 9843 PciRoot(0x0)/Pci(0x1d,0x0)/USB(1,0)/USB(4,0)/HD(1,MBR,0x6b953a68,0x1800,0x10801)AMBO
bill@debian:/etc$ sudo parted -l
Model: ATA WDC WD5000AAKX-0 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 538MB 537MB fat32 boot, esp
2 538MB 499GB 499GB ext4
3 499GB 500GB 1023MB linux-swap(v1) swap
Model: Generic STORAGE DEVICE (scsi)
Disk /dev/sdb: 1978MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 3146kB 37.7MB 34.6MB primary fat32 boot
2 38.8MB 317MB 278MB primary fat32 lba
bill@debian:/etc$ cd /
bill@debian:/$ ll # alias for ‘ls -alF’
total 84
drwxr-xr-x 20 root root 4096 Nov 3 01:40 ./
drwxr-xr-x 20 root root 4096 Nov 3 01:40 ../
lrwxrwxrwx 1 root root 7 Nov 22 17:06 bin -> usr/bin/
drwxr-xr-x 5 root root 4096 Dec 1 15:30 boot/
drwx------ 2 root root 4096 Nov 22 17:49 .cache/
drwxr-xr-x 2 root root 4096 Dec 4 19:35 debootstrap/
drwxr-xr-x 18 root root 3300 Dec 5 09:53 dev/
drwxr-xr-x 134 root root 12288 Dec 5 10:04 etc/
drwxr-xr-x 4 root root 4096 Nov 23 08:44 home/
lrwxrwxrwx 1 root root 29 Nov 22 17:09 initrd.img -> boot/initrd.img-6.0.0-4-amd64
lrwxrwxrwx 1 root root 29 Nov 22 17:09 initrd.img.old -> boot/initrd.img-6.0.0-4-amd64
lrwxrwxrwx 1 root root 7 Nov 22 17:06 lib -> usr/lib/
lrwxrwxrwx 1 root root 9 Nov 22 17:06 lib32 -> usr/lib32/
lrwxrwxrwx 1 root root 9 Nov 22 17:06 lib64 -> usr/lib64/
lrwxrwxrwx 1 root root 10 Nov 22 17:06 libx32 -> usr/libx32/
drwx------ 2 root root 16384 Nov 22 17:05 lost+found/
drwxr-xr-x 4 root root 4096 Dec 4 19:34 media/
drwxr-xr-x 2 root root 4096 Nov 22 17:06 mnt/
drwxr-xr-x 2 root root 4096 Nov 22 17:06 opt/
dr-xr-xr-x 255 root root 0 Dec 4 19:44 proc/
drwx------ 7 root root 4096 Nov 27 15:19 root/
drwxr-xr-x 29 root root 760 Dec 5 09:53 run/
lrwxrwxrwx 1 root root 8 Nov 22 17:06 sbin -> usr/sbin/
drwxr-xr-x 2 root root 4096 Nov 22 17:06 srv/
dr-xr-xr-x 13 root root 0 Dec 4 19:44 sys/
drwxrwxrwt 18 root root 4096 Dec 5 10:11 tmp/
drwxr-xr-x 14 root root 4096 Nov 3 01:40 usr/
drwxr-xr-x 11 root root 4096 Nov 22 17:06 var/
lrwxrwxrwx 1 root root 26 Nov 22 17:09 vmlinuz -> boot/vmlinuz-6.0.0-4-amd64
lrwxrwxrwx 1 root root 26 Nov 22 17:09 vmlinuz.old -> boot/vmlinuz-6.0.0-4-amd64
bill@debian:/boot$ ll
total 56744
drwxr-xr-x 5 root root 4096 Dec 1 15:30 ./
drwxr-xr-x 20 root root 4096 Nov 3 01:40 ../
-rw-r--r-- 1 root root 257618 Nov 11 00:36 config-6.0.0-4-amd64
drwx------ 5 root root 4096 Dec 31 1969 efi/
drwxr-xr-x 3 root root 4096 Dec 1 15:03 EFI/
drwxrwxr-x 9 root root 4096 Jul 2 13:32 grub/
-rw-r--r-- 1 root root 50022802 Nov 22 17:55 initrd.img-6.0.0-4-amd64
-rw-r--r-- 1 root root 83 Nov 11 00:36 System.map-6.0.0-4-amd64
-rw-r--r-- 1 root root 7795072 Nov 11 00:36 vmlinuz-6.0.0-4-amd64
bill@debian:/boot/EFI$ ll
total 12
drwxr-xr-x 3 root root 4096 Dec 1 15:03 ./
drwxr-xr-x 5 root root 4096 Dec 1 15:30 ../
drwxr-xr-x 2 root root 4096 Dec 1 15:03 grub/
bill@debian:/boot/EFI$ sudo hd -n 512 /dev/sda
00000000 eb 63 90 00 00 00 00 00 00 00 00 00 00 00 00 00 |.c..............|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000050 00 00 00 00 00 00 00 00 00 00 00 80 4c 12 1a 00 |............L...|
00000060 00 00 00 00 ff fa 90 90 f6 c2 80 74 05 f6 c2 70 |...........t...p|
00000070 74 02 b2 80 ea 79 7c 00 00 31 c0 8e d8 8e d0 bc |t....y|..1......|
00000080 00 20 fb a0 64 7c 3c ff 74 02 88 c2 52 be 80 7d |. ..d|<.t...R..}|
00000090 e8 17 01 be 05 7c b4 41 bb aa 55 cd 13 5a 52 72 |.....|.A..U..ZRr|
000000a0 3d 81 fb 55 aa 75 37 83 e1 01 74 32 31 c0 89 44 |=..U.u7...t21..D|
000000b0 04 40 88 44 ff 89 44 02 c7 04 10 00 66 8b 1e 5c |.@.D..D.....f..\|
000000c0 7c 66 89 5c 08 66 8b 1e 60 7c 66 89 5c 0c c7 44 ||f.\.f..`|f.\..D|
000000d0 06 00 70 b4 42 cd 13 72 05 bb 00 70 eb 76 b4 08 |..p.B..r...p.v..|
000000e0 cd 13 73 0d 5a 84 d2 0f 83 d8 00 be 8b 7d e9 82 |..s.Z........}..|
000000f0 00 66 0f b6 c6 88 64 ff 40 66 89 44 04 0f b6 d1 |.f....d.@f.D....|
00000100 c1 e2 02 88 e8 88 f4 40 89 44 08 0f b6 c2 c0 e8 |.......@.D......|
00000110 02 66 89 04 66 a1 60 7c 66 09 c0 75 4e 66 a1 5c |.f..f.`|f..uNf.\|
00000120 7c 66 31 d2 66 f7 34 88 d1 31 d2 66 f7 74 04 3b ||f1.f.4..1.f.t.;|
00000130 44 08 7d 37 fe c1 88 c5 30 c0 c1 e8 02 08 c1 88 |D.}7....0.......|
00000140 d0 5a 88 c6 bb 00 70 8e c3 31 db b8 01 02 cd 13 |.Z....p..1......|
00000150 72 1e 8c c3 60 1e b9 00 01 8e db 31 f6 bf 00 80 |r...`......1....|
00000160 8e c6 fc f3 a5 1f 61 ff 26 5a 7c be 86 7d eb 03 |......a.&Z|..}..|
00000170 be 95 7d e8 34 00 be 9a 7d e8 2e 00 cd 18 eb fe |..}.4...}.......|
00000180 47 52 55 42 20 00 47 65 6f 6d 00 48 61 72 64 20 |GRUB .Geom.Hard |
00000190 44 69 73 6b 00 52 65 61 64 00 20 45 72 72 6f 72 |Disk.Read. Error|
000001a0 0d 0a 00 bb 01 00 b4 0e cd 10 ac 3c 00 75 f4 c3 |...........<.u..|
000001b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001c0 02 00 ee ff ff ff 01 00 00 00 2f 60 38 3a 00 00 |........../`8:..|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200