Comment 6 for bug 2039342

 kcrpl@raspberrypi-4-kcrpl:~$ ls /usr/lib/dhcpcd/dhcpcd-run-hooks
 ls: cannot access '/usr/lib/dhcpcd/dhcpcd-run-hooks': No such file or directory

 kcrpl@raspberrypi-4-kcrpl:~$ sudo apt install --reinstall dhcpcd-base
 Reading package lists... Done
 Building dependency tree... Done
 Reading state information... Done
 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
 Need to get 208 kB of archives.
 After this operation, 0 B of additional disk space will be used.
 Get:1 http://ports.ubuntu.com/ubuntu-ports mantic/main arm64 dhcpcd-base arm64 1:10.0.2-3ubuntu3 [208 kB]
 Fetched 208 kB in 0s (580 kB/s)
 (Reading database ... 214263 files and directories currently installed.)
 Preparing to unpack .../dhcpcd-base_1%3a10.0.2-3ubuntu3_arm64.deb ...
 Unpacking dhcpcd-base (1:10.0.2-3ubuntu3) over (1:10.0.2-3ubuntu3) ...
 Setting up dhcpcd-base (1:10.0.2-3ubuntu3) ...
 Processing triggers for man-db (2.11.2-3) ...
 Scanning processes...
 Scanning processor microcode...
 Scanning linux images...

 Running kernel seems to be up-to-date.

 Failed to check for processor microcode upgrades.

 No services need to be restarted.

 No containers need to be restarted.

 No user sessions are running outdated binaries.

 No VM guests are running outdated hypervisor (qemu) binaries on this host.

 kcrpl@raspberrypi-4-kcrpl:~$ ls /usr/lib/dhcpcd/dhcpcd-run-hooks
 /usr/lib/dhcpcd/dhcpcd-run-hooks

 kcrpl@raspberrypi-4-kcrpl:~$ sudo update-initramfs -u
 (skipping log)

...it worked! This happened during the upgrade because before that everything worked correctly.

Thank you very much and have a great day!