Slim L2R2 dual analog 4ADC add-on issue

[Flavor]

Hmm.   I don't know why the operating system is in this situation.
 
That output definitely shows some problems.

The "sudo apt install --reinstall raspberrypi-bootloader" command didn't work. 

For one thing, I think you might want to run

sudo apt update

first.

I honestly really don't know, but I wonder if this command would fix that dependency in your error.

sudo apt install --reinstall libraspberrypi0 raspberrypi-bootloader

AND, before you do install the bootloader, I think you have to make sure that /boot is writeable.  Yours might be, so this may not be necessary.  

This will show if it's already "rw" (read/write).  Maybe post the output of this (after a reboot).

mount |grep boot

If it isn't, you might do this before the sudo apt install --reinstall command

Code:

mount -o remount, rw /boot

There's also the 'rpi-update' command that might work. I'm not sure how that plays with the apt version of the update. Maybe see https://www.reddit.com/r/raspberry_pi/co...pdate_and/


https://forums.raspberrypi.com/viewtopic.php?t=307418 (where the guy seemed to have a similar problem and never fixed it)