It is reasonable to request that these hooks use -e instead of -x for
maximum compatibility.  However:

> Is ubuntu officially supporting hardening (I think so as Debian is
doing it)?

No.  The existence of third-party "hardening" guides does not translate
to Ubuntu supporting this configuration.  dpkg itself relies
*extensively* on the ability to execute scripts from /tmp, as described
at <https://askubuntu.com/questions/574259/will-mounting-tmp-with-
noexec-and-nosuid-cause-problems>.

You mention the Securing Debian HOWTO, which does not say that this is 
recommended or mandatory for securing a system, and specifically calls out 
problems with noexec /tmp and the package manager. 
 https://www.debian.org/doc/manuals/securing-debian-howto/ch4.en.html#s4.10  
(The linked bug is closed with a recommended workaround.  If you were using 
that workaround, you would not be having problems with cryptsetup's hooks, 
since initramfs-tools also respects TMPDIR.)

And these hooks come from Debian as-is.  So this is no more supported by
the cryptsetup package in Debian than it is in Ubuntu.

** Changed in: cryptsetup (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: cryptsetup (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1791241

Title:
  If /var/tmp is mounted with noexec the scripts skip the copy of some
  files

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