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[Launchpad Bug Tracker <1536353@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lsb - 9.20160110ubuntu0.1

---------------
lsb (9.20160110ubuntu0.1) xenial; urgency=medium

  * lsb_release.py: restore support for querying the list of installed
    modules, since for the moment some modules are still supported.

  [ Till Kamppeter ]
  * Re-added LSB compatibility packages, so that auto-downloadable
    LSB-based printer driver packages work.  Thanks to Till Kammpeter
    for the patch.  LP: #1536353
  * Added Conflicts/Replaces against cups-filters-invalid-mta and
    cups-filters-lsb for upgrade compatibility from the Xenial development
    cycle.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Tue, 21 Jun 2016
15:14:49 -0700

** Changed in: lsb (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1536353

Title:
  [regression] Printer drivers install is broken as lsb package is not
  available anymore

Status in cups-filters package in Ubuntu:
  Fix Released
Status in epson-inkjet-printer-escpr package in Ubuntu:
  Fix Released
Status in lsb package in Ubuntu:
  Fix Released
Status in cups-filters source package in Xenial:
  Fix Released
Status in epson-inkjet-printer-escpr source package in Xenial:
  Fix Released
Status in lsb source package in Xenial:
  Fix Released

Bug description:
  [SRU justification]
  Previous releases were compatible with third-party printer drivers provided in LSB package format (and also as .deb packages depending on the lsb package).  As of 16.04, because the LSB specifies ABIs for various libraries that are no longer supported in Ubuntu as obsolete, the packages for the lsb modules have been dropped in both Debian and Ubuntu.  This includes dropping of lsb-core, which is the component which provides the LSB-mandated ELF loader path - without which no lsb executable will work.

  This SRU will restore the bare minimum of LSB compatibility necessary
  to support known third-party LSB printer driver packages on Ubuntu
  16.04.

  [Regression potential]
  The reintroduced 'lsb' binary package is known to not fully satisfy the requirements for a complete LSB-compliant system.  This is a regression vs. Ubuntu 14.04; so anyone using LSB packages on Ubuntu 14.04 who upgrades to Ubuntu 16.04 may have the upgrade succeed without any warning from the package manager.

  As there are very few lsb packages in use in the wild, this is
  considered an acceptable regression, especially as this will land
  before the first 16.04 point release.

  [Test case]
  1. Download the epsion 201106w printer driver package from http://download.ebz.epson.net/dsc/op/stable/debian/dists/lsb3.2/main/binary-amd64/epson-inkjet-printer-201106w_1.0.1-1lsb3.2_amd64.deb
  2. Install the package and confirm that its dependencies are not satisfiable.
  3. Enable xenial-proposed.
  4. Install the package again and confirm that the dependencies are satisfied.
  5. Verify that /opt/epson-inkjet-printer-201106w/cups/lib/filter/epson_inkjet_printer_filter can be run without errors about missing lsb ld.so or missing libraries.

  Starting with Xenial, lsb compatibility packages were dropped (besides
  lsb-release and lsb-base):

  lsb (9.20150826) unstable; urgency=low

    * Drop all the LSB compatibility packages besides lsb-release and lsb-base
      - Drop packages-availability checking in lsb-release
      - Truncate README.Debian to a minimum
      - Document this in lsb-base.NEWS.Debian
    * Change the versioning number to avoid any ambiguity; use joeyh's
      version.date, with version being Debian next stable's

   -- Didier Raboud <odyx@xxxxxxxxxx>  Wed, 26 Aug 2015 12:00:00 +0200

  The problem is that downloadable printer drivers (like the ones from
  Openprinting, but also from other available providers) that are
  suggested when installing a printer on Ubuntu depends on lsb, which is
  not available anymore:

  epson-inkjet-printer-201106w:
   Dépend: lsb (>=3.2) but it is not installable

  This triggers a regression where it is not possible to setup a printer
  this way (downloading a driver where no local driver is available)
  anymore.

  I see two possible solutions:

  - Add a proper replaces field to one of the remaining lsb-* packages,
  to hopefully fix missing lsb package (maybe it would be useful to also
  replace other compability packages that are not built anymore).

  - Re-introduce LSB compatibility packages, but that might be an
  overkill.

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