Previously I booted a "live CD (USB stick)" and found various fsck(8) errors and the missing grub files, had to reinstalled grub, This time the live CD can find no issues and it's not grub reporting an error:
Now this is the /boot disk. (/dev/sdb1) So my 1st guess would be the device is not responding, but following the long timeout (see photo)
it eventually gets to "enter root password or ctrl-D ...hitting ctrl-D gets me to a normal desktop. I can mount /boot just fine. It passes fsck(8) all seems fine with it. the UUID also appears in the list:
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graeme@real:~$ sudo ls -l /dev/disk/by-uuid/ | grep 0732
lrwxrwxrwx 1 root root 10 Jun 5 18:49 b1aa87e8-8e0e-48d6-aa7a-062472100732 -> ../../sdb1
graeme@real:~$ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 447.14 GiB, 480113590272 bytes, 937721856 sectors
Disk model: SanDisk SSD PLUS
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: 0x53e4e91d
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root@real:/var/log# mount | grep boot
/dev/sdb1 on /boot type ext4 (rw,relatime)
root@real:/var/log# ls -l /boot
total 248149
-rw-r--r-- 1 root root 83 Dec 9 05:54 System.map-6.0.0-6-amd64
-rw-r--r-- 1 root root 83 Apr 8 16:36 System.map-6.1.0-7-amd64
-rw-r--r-- 1 root root 83 Apr 22 19:48 System.map-6.1.0-8-amd64
-rw-r--r-- 1 root root 83 May 8 21:16 System.map-6.1.0-9-amd64
drwxr-xr-x 3 root root 1024 May 23 15:52 boot
...elided...
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root@real:/var/log# cat /etc/*release*
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
...