adduser command fails when a mythtv user already exists

Editing the postinst script and commenting the add user line allows myth to upgrade.

bzr $178

This bug was fixed in the package mythtv - 0.21.0+fixes19136-0ubuntu3

---------------
mythtv (0.21.0+fixes19136-0ubuntu3) jaunty; urgency=low

  [ Michael Haas ]
  * Drop debian/patches/28_fix_v4l.dpatch because upstream
    fixed this properly in r19250.

  [ Mario Limonciello ]
  * debian/mythtv-database.postinst:
    - Don't reset the backend IPs unless you
      are loading a database
    - Pre-set mythbuntu theme. If mythbuntu theme isn't
      around, G.A.N.T. gets loaded instead, so no expected
      regresssions.
  * debian/mythtv-database.config:
    - Try to get answer from mysql-server config if possible
      this avoids asking admin pass question twice.
    - Check if mysql binary is around before repeatedly
      asking questions.
   - Check if localhost that mysqld is running. If it's
      not, then don't keep asking questions.
    - Pass on failed answer to postinst (don't reset)
  * debian/mythtv-common.config:
    - Display the password that is set, not just "value set"
  * debian/mythtv-common.postinst:
    - Only create a user if it doesn't already exist. (LP: #280974)
  * debian/rules:
    - Unset executable permissions on .sh and .d files in clean
      section. (LP: #311573)
    - Don't restart mythtv-backend on upgrade of packages.
      Unexpected behavior might happen depending on what other packages
      are installed at that time and what will still be installed.
      The common use case for a problem here is dist-upgrades.
      (LP: #298914)
  * Store .sh and .d files as non executable in bzr to better reflect
    flat packaging as seen in the archive.
  * debian/patches/24_fix_h264_frame_counting.dpatch:
    - Remove .orig file from the patch as it's unnecessary (LP: #311549)
  * debian/mythtv-backend.postinst:
    - If we are mounted on NFS, changing permissions will fail. Don't
      fail the postinst in this case. (LP: #299352)

  [ TJ ]
  * debian/rules:
    - Cleanup files that upstream is forgetting to clean between builds.
      (LP: #311552)

 -- Mario Limonciello <email address hidden> Fri, 02 Jan 2009 14:28:58 -0600