Kernel crashes Raspberry PI 3B+

[John Fredrick Robison]

[sudo] password for astroberry:
root@astroberry:/home/astroberry# dpkg --configure -a
Setting up flash-kernel (3.103ubuntu1~20.10.1) ...
Using DTB: bcm2710-rpi-3-b-plus.dtb
Installing /etc/flash-kernel/dtbs/bcm2710-rpi-3-b-plus.dtb into /boot/dtbs//./bcm2710-rpi-3-b-plus.dtb
Taking backup of bcm2710-rpi-3-b-plus.dtb.
Installing new bcm2710-rpi-3-b-plus.dtb.
ln: failed to create symbolic link '/boot/dtb-/bcm2710-rpi-3-b-plus.dtb': Operation not permitted
dpkg: error processing package flash-kernel (--configure):
 installed flash-kernel package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 flash-kernel

Raspberry PI says this is an UBUNTU problem. Ubuntu says this is a Raspberry PI issue.

This is the bug.

'/boot/dtb-/bcm2710-rpi-3-b-plus.dtb' does not exist. A symbolic link cannnot be created with nothing. Also,

/boot/dtb
/boot/dtb-1
/boot/dtb-

cannot be written into. They are all empty.

I have multiple Linux machines. This is the only one which fails to install Flash Kernel since Nov 20, 2020.

root@astroberry:/home/astroberry# ls -all /boot/dtb
total 20
drwxr-xr-x 2 root root 4096 Sep 2 2020 .
drwxr-xr-x 11 root root 16384 Dec 31 1969 ..
root@astroberry:/home/astroberry# ls -all /boot/dtb-1
total 20
drwxr-xr-x 2 root root 4096 Oct 20 2019 .
drwxr-xr-x 11 root root 16384 Dec 31 1969 ..
root@astroberry:/home/astroberry# ls -all /boot/dtb-
total 20
drwxr-xr-x 2 root root 4096 Apr 22 22:54 .
drwxr-xr-x 11 root root 16384 Dec 31 1969 ..

These folders are empty. Nothing can be copied into them

1.
root@astroberry:/home/astroberry# lsb_release -rd
Description: Ubuntu 20.10
Release: 20.10

2.
root@astroberry:/home/astroberry# apt-cache policy pkgname
N: Unable to locate package pkgname
root@astroberry:/home/astroberry#

3.
Installation of Flash Kernel.

4.
Failed. Dows not install properly. Prevents other installations from completing.

[Dave Jones (waveform)]

The Raspberry Pi company are certainly correct that this would be an Ubuntu / Debian issue (RaspiOS né Raspbian doesn't use flash-kernel to install its kernel on the boot partition). However, the "/boot/dtb-" link is worrying (after the dash should come a kernel version) and suggests something rather more serious is amiss.

Can I ask which Ubuntu image you're using specifically, and exactly how it's installed? (the fact that f-k is complaining about "operation not permitted" when it's running as root suggests something like a boot partition being mounted read-only).

[Launchpad Janitor (janitor)]

[Expired for flash-kernel (Ubuntu) because there has been no activity for 60 days.]