apt full-upgrade fails - [1.20250326] - /etc/kernel/postinst.d/z50-raspi-firmware: 78: rsync: not found

**Describe the bug**
Updating from kernel 6.6.51 to latest 6.12.20. 
And installing rsync solves it, I wonder why rsync is needed at post kernel install script?

**To reproduce**
```bash
$ sudo apt update
$ sudo apt upgrade # full-upgrade
```

**Expected behaviour**
No errors

**Actual behaviour**
Errors

This is the info after installing rsync `sudo apt install rsync`, so it might not be useful anymore

**System**
[raspinfo.txt](https://github.com/user-attachments/files/19662080/raspinfo.txt)

* Which model of Raspberry Pi? 
Raspberry Pi 5
* Which OS and version (`cat /etc/rpi-issue`)? 
Raspberry Pi reference 2024-11-19
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 891df1e21ed2b6099a2e6a13e26c91dea44b34d4, stage2
* Which firmware version (`vcgencmd version`)?
2025/03/10 17:10:37
Copyright (c) 2012 Broadcom
version 2bb2ae64 (release) (embedded)
* Which kernel version (`uname -a`)?
Linux raspberrypi 6.12.18-v8-16k+ #1862 SMP PREEMPT Wed Mar 12 12:33:09 GMT 2025 aarch64 GNU/Linux

**Logs**
```bash
sudo apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-headers-6.12.20+rpt-common-rpi linux-headers-6.12.20+rpt-rpi-2712 linux-headers-6.12.20+rpt-rpi-v8
  linux-image-6.12.20+rpt-rpi-2712 linux-image-6.12.20+rpt-rpi-v8 linux-kbuild-6.12.20+rpt
The following packages will be upgraded:
  base-files curl dns-root-data ghostscript libc-bin libc-dev-bin libc-devtools libc-l10n libc6 libc6-dbg libc6-dev
  libcurl3-gnutls libcurl4 libfreetype6 libgs-common libgs10 libgs10-common liblzma5 libnm0 libnuma1 libpam-systemd
  libpixman-1-0 libsystemd-shared libsystemd0 libudev1 libxslt1.1 linux-headers-rpi-2712 linux-headers-rpi-v8
  linux-image-rpi-2712 linux-image-rpi-v8 linux-libc-dev locales network-manager raspi-config raspi-utils
  raspi-utils-core raspi-utils-dt raspi-utils-eeprom raspi-utils-otp raspinfo rpi-eeprom systemd systemd-sysv tzdata
  udev vim-common vim-tiny wget xz-utils
49 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 124 MB of archives.
After this operation, 110 MB of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 http://deb.debian.org/debian bookworm/main arm64 base-files arm64 12.4+deb12u10 [70.9 kB]
Get:2 http://deb.debian.org/debian bookworm/main arm64 systemd-sysv arm64 252.36-1~deb12u1 [42.6 kB]
Get:3 http://deb.debian.org/debian bookworm/main arm64 libpam-systemd arm64 252.36-1~deb12u1 [209 kB]
Get:4 http://deb.debian.org/debian-security bookworm-security/main arm64 liblzma5 arm64 5.4.1-1 [199 kB]
Get:5 http://deb.debian.org/debian bookworm/main arm64 systemd arm64 252.36-1~deb12u1 [2,837 kB]
Get:6 http://deb.debian.org/debian bookworm/main arm64 libsystemd-shared arm64 252.36-1~deb12u1 [1,511 kB]
Get:7 http://deb.debian.org/debian bookworm/main arm64 libsystemd0 arm64 252.36-1~deb12u1 [308 kB]
Get:8 http://deb.debian.org/debian bookworm/main arm64 udev arm64 252.36-1~deb12u1 [1,640 kB]
Get:9 http://deb.debian.org/debian bookworm/main arm64 libudev1 arm64 252.36-1~deb12u1 [103 kB]
Get:10 http://deb.debian.org/debian bookworm-updates/main arm64 tzdata all 2025b-0+deb12u1 [299 kB]
Get:11 http://deb.debian.org/debian bookworm/main arm64 vim-tiny arm64 2:9.0.1378-2+deb12u2 [652 kB]
Get:12 http://deb.debian.org/debian bookworm/main arm64 vim-common all 2:9.0.1378-2+deb12u2 [125 kB]
Get:13 http://deb.debian.org/debian bookworm/main arm64 wget arm64 1.21.3-1+deb12u1 [922 kB]
Get:14 http://deb.debian.org/debian-security bookworm-security/main arm64 xz-utils arm64 5.4.1-1 [469 kB]
Get:15 http://deb.debian.org/debian bookworm/main arm64 curl arm64 7.88.1-10+deb12u12 [309 kB]
Get:16 http://deb.debian.org/debian bookworm/main arm64 libcurl4 arm64 7.88.1-10+deb12u12 [367 kB]
Get:17 http://deb.debian.org/debian bookworm/main arm64 dns-root-data all 2024071801~deb12u1 [5,752 B]
Get:18 http://deb.debian.org/debian-security bookworm-security/main arm64 ghostscript arm64 10.0.0~dfsg-11+deb12u7 [57.8 kB]
Get:19 http://deb.debian.org/debian-security bookworm-security/main arm64 libgs10 arm64 10.0.0~dfsg-11+deb12u7 [2,255 kB]
Get:20 http://deb.debian.org/debian-security bookworm-security/main arm64 libgs10-common all 10.0.0~dfsg-11+deb12u7 [587 kB]
Get:21 http://deb.debian.org/debian-security bookworm-security/main arm64 libgs-common all 10.0.0~dfsg-11+deb12u7 [149 kB]
Get:22 http://deb.debian.org/debian-security bookworm-security/main arm64 libfreetype6 arm64 2.12.1+dfsg-5+deb12u4 [368 kB]
Get:23 http://deb.debian.org/debian bookworm/main arm64 libcurl3-gnutls arm64 7.88.1-10+deb12u12 [362 kB]
Get:24 http://deb.debian.org/debian-security bookworm-security/main arm64 libxslt1.1 arm64 1.1.35-1+deb12u1 [220 kB]
Get:25 http://archive.raspberrypi.com/debian bookworm/main arm64 libc6-dbg arm64 2.36-9+rpt2+deb12u10 [8,151 kB]
Get:26 http://archive.raspberrypi.com/debian bookworm/main arm64 libc-devtools arm64 2.36-9+rpt2+deb12u10 [60.9 kB]
Get:27 http://archive.raspberrypi.com/debian bookworm/main arm64 libc6-dev arm64 2.36-9+rpt2+deb12u10 [2,092 kB]
Get:28 http://archive.raspberrypi.com/debian bookworm/main arm64 libc-dev-bin arm64 2.36-9+rpt2+deb12u10 [49.5 kB]
Get:29 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-libc-dev all 1:6.12.20-1+rpt1~bpo12+1 [2,314 kB]
Get:30 http://archive.raspberrypi.com/debian bookworm/main arm64 libc6 arm64 2.36-9+rpt2+deb12u10 [4,991 kB]
Get:31 http://archive.raspberrypi.com/debian bookworm/main arm64 libc-bin arm64 2.36-9+rpt2+deb12u10 [749 kB]
Get:32 http://archive.raspberrypi.com/debian bookworm/main arm64 libc-l10n all 2.36-9+rpt2+deb12u10 [1,541 kB]
Get:33 http://archive.raspberrypi.com/debian bookworm/main arm64 locales all 2.36-9+rpt2+deb12u10 [5,085 kB]
Get:34 http://archive.raspberrypi.com/debian bookworm/main arm64 network-manager arm64 1.42.4-1+rpt1+deb12u1 [5,253 kB]
Get:35 http://archive.raspberrypi.com/debian bookworm/main arm64 libnm0 arm64 1.42.4-1+rpt1+deb12u1 [547 kB]
Get:36 http://archive.raspberrypi.com/debian bookworm/main arm64 libnuma1 arm64 2.0.18-1~rpt1 [26.2 kB]
Get:37 http://archive.raspberrypi.com/debian bookworm/main arm64 libpixman-1-0 arm64 0.44.0-3+rpt1 [221 kB]
Get:38 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-headers-6.12.20+rpt-common-rpi all 1:6.12.20-1+rpt1~bpo12+1 [8,748 kB]
Get:39 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-image-6.12.20+rpt-rpi-2712 arm64 1:6.12.20-1+rpt1~bpo12+1 [31.6 MB]
Get:40 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-kbuild-6.12.20+rpt arm64 1:6.12.20-1+rpt1~bpo12+1 [1,191 kB]
Get:41 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-headers-6.12.20+rpt-rpi-2712 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,340 kB]
Get:42 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-image-6.12.20+rpt-rpi-v8 arm64 1:6.12.20-1+rpt1~bpo12+1 [31.6 MB]
Get:43 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-headers-6.12.20+rpt-rpi-v8 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,340 kB]
Get:44 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-headers-rpi-2712 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,172 B]
Get:45 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-headers-rpi-v8 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,160 B]
Get:46 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-image-rpi-2712 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,424 B]
Get:47 http://archive.raspberrypi.com/debian bookworm/main arm64 linux-image-rpi-v8 arm64 1:6.12.20-1+rpt1~bpo12+1 [1,436 B]
Get:48 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-utils-core arm64 20250314-1 [65.9 kB]
Get:49 http://archive.raspberrypi.com/debian bookworm/main arm64 rpi-eeprom all 27.6-1 [2,711 kB]
Get:50 http://archive.raspberrypi.com/debian bookworm/main arm64 raspinfo all 20250314-1 [7,844 B]
Get:51 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-utils-otp all 20250314-1 [8,168 B]
Get:52 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-utils-eeprom arm64 20250314-1 [25.1 kB]
Get:53 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-utils-dt arm64 20250314-1 [81.9 kB]
Get:54 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-utils all 20250314-1 [5,768 B]
Get:55 http://archive.raspberrypi.com/debian bookworm/main arm64 raspi-config all 20250312 [37.1 kB]
Fetched 124 MB in 14s (8,737 kB/s)
Reading changelogs... Done
Extracting templates from packages: 100%
Preconfiguring packages ...
(Reading database ... 115508 files and directories currently installed.)
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Installing new version of config file /etc/debian_version ...
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Setting up libpixman-1-0:arm64 (0.44.0-3+rpt1) ...
Setting up libc-l10n (2.36-9+rpt2+deb12u10) ...
Setting up raspi-utils-eeprom (20250314-1) ...
Setting up raspi-utils-otp (20250314-1) ...
Setting up wget (1.21.3-1+deb12u1) ...
Setting up linux-image-6.12.20+rpt-rpi-2712 (1:6.12.20-1+rpt1~bpo12+1) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-6.12.20+rpt-rpi-2712
'/boot/initrd.img-6.12.20+rpt-rpi-2712' -> '/boot/firmware/initramfs_2712'
/etc/kernel/postinst.d/z50-raspi-firmware:
/etc/kernel/postinst.d/z50-raspi-firmware: 78: rsync: not found
run-parts: /etc/kernel/postinst.d/z50-raspi-firmware exited with return code 127
dpkg: error processing package linux-image-6.12.20+rpt-rpi-2712 (--configure):
 installed linux-image-6.12.20+rpt-rpi-2712 package post-installation script subprocess returned error exit status 1
Setting up libgs-common (10.0.0~dfsg-11+deb12u7) ...
Setting up raspi-utils-dt (20250314-1) ...
Setting up linux-libc-dev (1:6.12.20-1+rpt1~bpo12+1) ...
Setting up libcurl3-gnutls:arm64 (7.88.1-10+deb12u12) ...
Setting up locales (2.36-9+rpt2+deb12u10) ...
Generating locales (this might take a while)...
  en_GB.UTF-8... done
Generation complete.
Setting up libc6-dbg:arm64 (2.36-9+rpt2+deb12u10) ...
Setting up dns-root-data (2024071801~deb12u1) ...
Setting up tzdata (2025b-0+deb12u1) ...

Current default time zone: 'Asia/Manila'
Local time is now:      Wed Apr  9 14:44:11 PST 2025.
Universal Time is now:  Wed Apr  9 06:44:11 UTC 2025.
Run 'dpkg-reconfigure tzdata' if you wish to change it.

dpkg: dependency problems prevent configuration of linux-image-rpi-2712:
 linux-image-rpi-2712 depends on linux-image-6.12.20+rpt-rpi-2712 (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-image-6.12.20+rpt-rpi-2712 is not configured yet.

dpkg: error processing package linux-image-rpi-2712 (--configure):
 dependency problems - leaving unconfigured
Setting up vim-common (2:9.0.1378-2+deb12u2) ...
Setting up linux-headers-6.12.20+rpt-common-rpi (1:6.12.20-1+rpt1~bpo12+1) ...
Setting up libfreetype6:arm64 (2.12.1+dfsg-5+deb12u4) ...
Setting up xz-utils (5.4.1-1) ...
Setting up linux-kbuild-6.12.20+rpt (1:6.12.20-1+rpt1~bpo12+1) ...
Setting up udev (252.36-1~deb12u1) ...
Setting up libsystemd-shared:arm64 (252.36-1~deb12u1) ...
Setting up libnm0:arm64 (1.42.4-1+rpt1+deb12u1) ...
Setting up libnuma1:arm64 (2.0.18-1~rpt1) ...
Setting up linux-image-6.12.20+rpt-rpi-v8 (1:6.12.20-1+rpt1~bpo12+1) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-6.12.20+rpt-rpi-v8
'/boot/initrd.img-6.12.20+rpt-rpi-v8' -> '/boot/firmware/initramfs8'
/etc/kernel/postinst.d/z50-raspi-firmware:
/etc/kernel/postinst.d/z50-raspi-firmware: 78: rsync: not found
run-parts: /etc/kernel/postinst.d/z50-raspi-firmware exited with return code 127
dpkg: error processing package linux-image-6.12.20+rpt-rpi-v8 (--configure):
 installed linux-image-6.12.20+rpt-rpi-v8 package post-installation script subprocess returned error exit status 1
Setting up libxslt1.1:arm64 (1.1.35-1+deb12u1) ...
Setting up libcurl4:arm64 (7.88.1-10+deb12u12) ...
Setting up curl (7.88.1-10+deb12u12) ...
Setting up libc-dev-bin (2.36-9+rpt2+deb12u10) ...
dpkg: dependency problems prevent configuration of linux-headers-6.12.20+rpt-rpi-2712:
 linux-headers-6.12.20+rpt-rpi-2712 depends on linux-image-6.12.20+rpt-rpi-2712 (= 1:6.12.20-1+rpt1~bpo12+1) | linux-image-6.12.20+rpt-rpi-2712-unsigned (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-image-6.12.20+rpt-rpi-2712 is not configured yet.
  Package linux-image-6.12.20+rpt-rpi-2712-unsigned is not installed.

dpkg: error processing package linux-headers-6.12.20+rpt-rpi-2712 (--configure):
 dependency problems - leaving unconfigured
Setting up raspi-utils-core (20250314-1) ...
Setting up libc-devtools (2.36-9+rpt2+deb12u10) ...
Setting up libgs10-common (10.0.0~dfsg-11+deb12u7) ...
Setting up systemd (252.36-1~deb12u1) ...
Setting up network-manager (1.42.4-1+rpt1+deb12u1) ...
Setting up vim-tiny (2:9.0.1378-2+deb12u2) ...
dpkg: dependency problems prevent configuration of linux-headers-6.12.20+rpt-rpi-v8:
 linux-headers-6.12.20+rpt-rpi-v8 depends on linux-image-6.12.20+rpt-rpi-v8 (= 1:6.12.20-1+rpt1~bpo12+1) | linux-image-6.12.20+rpt-rpi-v8-unsigned (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-image-6.12.20+rpt-rpi-v8 is not configured yet.
  Package linux-image-6.12.20+rpt-rpi-v8-unsigned is not installed.

dpkg: error processing package linux-headers-6.12.20+rpt-rpi-v8 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-headers-rpi-2712:
 linux-headers-rpi-2712 depends on linux-headers-6.12.20+rpt-rpi-2712 (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-headers-6.12.20+rpt-rpi-2712 is not configured yet.

dpkg: error processing package linux-headers-rpi-2712 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-image-rpi-v8:
 linux-image-rpi-v8 depends on linux-image-6.12.20+rpt-rpi-v8 (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-image-6.12.20+rpt-rpi-v8 is not configured yet.

dpkg: error processing package linux-image-rpi-v8 (--configure):
 dependency problems - leaving unconfigured
Setting up libc6-dev:arm64 (2.36-9+rpt2+deb12u10) ...
Setting up libgs10:arm64 (10.0.0~dfsg-11+deb12u7) ...
dpkg: dependency problems prevent configuration of linux-headers-rpi-v8:
 linux-headers-rpi-v8 depends on linux-headers-6.12.20+rpt-rpi-v8 (= 1:6.12.20-1+rpt1~bpo12+1); however:
  Package linux-headers-6.12.20+rpt-rpi-v8 is not configured yet.

dpkg: error processing package linux-headers-rpi-v8 (--configure):
 dependency problems - leaving unconfigured
Setting up systemd-sysv (252.36-1~deb12u1) ...
Setting up ghostscript (10.0.0~dfsg-11+deb12u7) ...
Setting up libpam-systemd:arm64 (252.36-1~deb12u1) ...
Setting up raspi-utils (20250314-1) ...
Setting up rpi-eeprom (27.6-1) ...
Setting up raspi-config (20250312) ...
Setting up raspinfo (20250314-1) ...
Processing triggers for libc-bin (2.36-9+rpt2+deb12u10) ...
Processing triggers for man-db (2.11.2-2) ...
Processing triggers for dbus (1.14.10-1~deb12u1) ...
Processing triggers for ntpsec (1.2.2+dfsg1-1+deb12u1) ...
Processing triggers for initramfs-tools (0.142+rpt3+deb12u1) ...
update-initramfs: Generating /boot/initrd.img-6.12.20+rpt-rpi-v8
'/boot/initrd.img-6.12.20+rpt-rpi-v8' -> '/boot/firmware/initramfs8'
update-initramfs: Generating /boot/initrd.img-6.12.20+rpt-rpi-2712
'/boot/initrd.img-6.12.20+rpt-rpi-2712' -> '/boot/firmware/initramfs_2712'
Processing triggers for hicolor-icon-theme (0.17-2) ...
Errors were encountered while processing:
 linux-image-6.12.20+rpt-rpi-2712
 linux-image-rpi-2712
 linux-image-6.12.20+rpt-rpi-v8
 linux-headers-6.12.20+rpt-rpi-2712
 linux-headers-6.12.20+rpt-rpi-v8
 linux-headers-rpi-2712
 linux-image-rpi-v8
 linux-headers-rpi-v8
E: Sub-process /usr/bin/dpkg returned an error code (1)
```

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apt full-upgrade fails - [1.20250326] - /etc/kernel/postinst.d/z50-raspi-firmware: 78: rsync: not found #1963

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apt full-upgrade fails - [1.20250326] - /etc/kernel/postinst.d/z50-raspi-firmware: 78: rsync: not found #1963

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