Public bug reported:

[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.

** Affects: flash-kernel (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1926186

Title:
  Kernel crashes Raspberry PI 3B+

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