I reproduced the error today

Format SD Card 32Gb Sony Class 10

SD Card Formater

Burn SD Card

Win32diskImager
kali-linux-2018.3-rpi3-nexmon.img

Boot

No Problem

Gparted

Available space on ext4 28Gb

Update: "In terminal"

apt-get update (No Problem)

Upgrade "In Terminal"

apt-get upgrade

Same error as described..

--

Next test..

apt-get update (No problem)

apt-get install kali-linux-full (no problem)

apt-get upgrade (same problem)

I think this error explains your problem:

Error: missing /boot/firmware, did you forget to mount it?

Run the command:

mount | grep /boot

You should see something similar:

/dev/mmcblk0p1 on /boot (..snipped..)

If you don't see anything, mount the boot partition and run the upgrade command again:

mount /dev/mmcblk0p1 /boot
apt-get upgrade

every time i try to upgrade i had the same problem
amo is this solve the problem?

any solutions ?

Didn't solve it..

mount | grep /boot
/dev/mmcblk0p1 on /boot type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro)

mount /dev/mmcblk0p1 /boot
mount: /boot: /dev/mmcblk0p1 already mounted on /boot

apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
libfile-mimeinfo-perl
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up raspi3-firmware (1.20180619-1) ...
Error: missing /boot/firmware, did you forget to mount it?
dpkg: error processing package raspi3-firmware (--configure):
installed raspi3-firmware package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
raspi3-firmware
E: Sub-process /usr/bin/dpkg returned an error code (1)

same with me or if i dind't get this firmware error the upgrade corrupt the filesystem
i don't know why we both just talking and the supports why won't help?

The error comes because of a change made in the 2018.3 release to use the Debian package for the firmware. Unfortunately, there was never an update during the process of adding it so I never ran into the issue before release.

There is a workaround, to at least get rid of the error.

You'll want to add the following to /etc/fstab:

tmpfs /boot/firmware tmpfs rw 0 0

At the bottom, and then simply run "mount /boot/firmware" (or reboot) and re-run the update.

This allows the package to update, which is good, but does not copy the new files into place.

Debian uses a different mounting layout than we do, and their check is for /boot/firmware to be mounted, instead of just /boot.

Once the update succeeds, you will want to

cp /usr/lib/raspi3-firmware/* /boot/

to use the new firmware.

I'm still working out a better long term solution.

thank you for the reply if i finished at work i try it

Thanks for the work around..

I tried the solution on a new install and there it worked like a charm...

I'm not sure if it would work after an rpi-firmware upgrade but for now I can live with this solution.

So again, THANKS

The solution sticks around if you added the tmpfs one to /etc/fstab - otherwise, next time there's an upgrade, you'll have to do it again.

I still haven't worked out a good lasting solution yet, unfortunately, aside from going back to manually updating the firmware, but still trying to figure out the best path forward.