[Bug 2001556] Re: systemd-cryptenroll poorly communicates libtss2-rc0 dependency

[Avinash Sonawane]

> "TPM2 support is not installed." means the binary was compiled with
TPM2 support, but you need to install the libraries.

Which libraries? I personally installed handful of packages and then
figured it out it to be the `libtss2-rc0` with trail and error. It took
quite some time.

`systemd` suggests `libtss2-esys-3.0.2-0`, `libtss2-mu0`, `libtss2-rc0`
(these 3 show same package description) among others. How am I (user)
supposed to figure it out which package to install to "fix" the "TPM2
support is not installed." message?

I understand not mentioning the specific package name but maybe showing
message like "Install TSS response code library" along with the the
"TPM2 support is not installed." error message or in the manpage of
`systemd-cryptenroll` will work?

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https://bugs.launchpad.net/bugs/2001556

Title:
  systemd-cryptenroll poorly communicates libtss2-rc0 dependency

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  Description:

  tpm2 support was added to jammy in 249.11-0ubuntu3.3 via LP1969375.
  libtss2-rc0 was added as a suggested package.

  $ systemd-cryptenroll --tpm2-device=list
  TPM2 support is not installed.

  Installing libtss2-rc0 allows this to resolve:
  $ sudo apt install libtss2-rc0
  $ systemd-cryptenroll --tpm2-device=list
  PATH        DEVICE      DRIVER
  /dev/tpmrm0 VTPM0101:00 tpm_crb

  While this isn't inherently an issue, two things are notable:

  + The manpage for systemd-cryptenroll makes no mention that the
  suggested package needs to be installed (that I could find), this is
  only noted via `apt depends`. I only happened to find this while
  building from source.

  + The presented error implies that the pkg was build with -Dtpm2=false
  (as I read it), which is not actually the case. It should properly
  indicate the missing dep.

  The choice to leave this as a suggested dep was deliberate, so I
  believe resolution of the above two issues would suffice to provide
  enduser clarity.

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