Because Debian doesn't use an event-based init system.
If you have further questions about plymouth, please ask on the ubuntu-
devel-discuss mailing list or the Ubuntu Forums, rather than reopening a
bug the developers have told you is invalid.
** Changed in: plymouth (Ubuntu)
Status: New
Then why doesn't Debian need it?
** Changed in: plymouth (Ubuntu)
Status: Won't Fix => New
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Plymouth Removes "Vital" Packages When Removed
https://bugs.launchpad.net/bugs/569327
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-
Plymouth is not an optional part of your system, we do not support you
removing it.
Note that your bug is also invalid; those packages are not removed, they
are merely suggested for automatic removal. You don't need to run "apt-
get autoremove" and can continue with them installed and a functioni