> Either Ubuntu's zsh package should do the same (or something similar),
or Ubuntu must put important environment variable stuff somewhere else
and have only bash-specific stuff in /etc/profile and /etc/profile.d.

Whilst I sympathise with the OP - I've used ZSH as my $SHELL for a
number of years in the past - I *do* object to the former - /etc/profile
*must* be POSIX/Bourne shell compliant[0].

The latter - files under /etc/profile.d - *should* be POSIX/Bourne shell
compliant, IMVHO.

Either way, all of the files *can* be made POSIX-compliant and have
something along the lines of:

    test $SHELL = /bin/bash && {
        ...
        Bash-specific stuff here
        ...
    }

after the POSIX-only setup.

ZSH can obviously source the then-made-POSIX-compliant options from
/etc/zshenv or /etc/zprofile[1] (or wherever they live nowadays).

This obviously only concerns the environment variables, settings, etc.
which are required to have the same functionality in terms of the
operating system, in a way which is $SHELL-agnostic. We're not talking
about options which only concern Bash or Zsh users, i.e. auto-
completion, etc.

[0] https://manpages.debian.org/unstable/dash/sh.1.en.html#FILES
[1] 
https://shreevatsa.wordpress.com/2008/03/30/zshbash-startup-files-loading-order-bashrc-zshrc-etc/

My £0.02

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https://bugs.launchpad.net/bugs/1800280

Title:
  Setting ZSH as the default shell causes various issues because it
  doesn't source /etc/profile

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