There is now a broken symlink in the plymouth-themes package:

   $ adequate plymouth-themes
   plymouth-themes: broken-symlink /usr/share/plymouth/themes/spinfinity/header-image.png -> ../../../pixmaps/system-logo-white.png

It looks like this image is only available on RedHat machines:

https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/89

Until the issue gets fixed upstream I think that it would be reasonable
to have the Debian packaging fix the symlink to use the Debian logo:

   $ chronic apt source plymouth-themes
   $ grep with-logo plymouth*/debian/rules
   		--with-logo=/usr/share/plymouth/debian-logo.png \

Some more information about the symlink:

   $ chase /usr/share/plymouth/themes/spinfinity/header-image.png
   chase: /usr/share/pixmaps/system-logo-white.png: No such file or directory

   $ ls -l /usr/share/pixmaps/system-logo-white.png
   ls: cannot access '/usr/share/pixmaps/system-logo-white.png': No such file or directory

   $ apt-file search system-logo-white ; echo $?
   1

   $ apt-file -I dsc search system-logo-white ; echo $?
   1

This bug report brought to you by adequate:

https://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/