Thanks you for the quick response.
Update-initramfs works without errors or warnings and dropbear correctly starts 
in the initial ramdisk environment created after applying 
0001-Copy-only-dhcpcd-user-into-initramfs-etc-passwd.patch.

I can not really say anything about the dhcpd functionality though.

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https://bugs.launchpad.net/bugs/2059739

Title:
  initramfs-tools 0.142ubuntu23 copies host /etc/passwd into initramfs

Status in initramfs-tools package in Ubuntu:
  In Progress

Bug description:
  Recent changes to the dhcpd hook shipped with dhcpdinitramfs-tools 
0.142ubuntu23 (noble-dev) copy the host /etc/passwd into the initramfs-image:
  
https://git.launchpad.net/ubuntu/+source/initramfs-tools/commit/hooks/dhcpcd?h=applied/ubuntu/noble&id=73c865b9d234087d977d7baa20852639746567fd

  This has multiple problems:
   * The passwd file is copied without checking if the dhcpcd user actually 
exists (which is created by dhcpcd package, but only dhcpcd-base is installed 
via dependencies)
   * The change breaks dropbear-initramfs because the passwd file contains a 
root user with a non existing home directory
   * leaking user information into initramfs (which may or may not be a problem 
on fully encrypted systems)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2059739/+subscriptions


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