adds invalid symbols to tags

This is actually the xorg package hook adding the tags.

        compiz_version = command_output(['compiz', '--version'])
        if compiz_version:
            version = compiz_version.split(' ')[1]
            version = version[:3]
            compiz_version_string = 'compiz-%s' % version
            report['Tags'] += ' ' + compiz_version_string

Huh. What does your `compiz --version` actually say?

~$ compiz --version
Compiz 0.9.7.0

This bug was fixed in the package xdiagnose - 2.2

---------------
xdiagnose (2.2) precise; urgency=low

  * apport hook fixes:
    + Fix tagging of compiz bugs. Only include the tag if we can extract
      a valid number from the compiz --version string.
      (LP: #927343)
    + Use main.log instead of apt.log for determining last major upgrade.
  * failsafe-X fixes:
    + Fix broken reconfigure option in failsafe-X scripts. Drop command to
      call Xorg -configure. In addition to not working in this case, when
      it does work it generates a xorg.conf that would never work.
      (LP: #565490)
  * xdiagnose applet fixes:
    + Fix crash with KeyError in run(): 'quiet' by checking key existance
      before deleting.
      (LP: #946836)
    + Fix non-closable error listings window, by converting main window from
      a Dialog to a Window.
      (LP: #941882)
    + Fix ^C in terminal to terminate the program.
    + Fix strings to not refer directly to Ubuntu, so can be more easily
      used in derivatives.
      (LP: #495253)
    + Fix crash about /etc/default/grub being unwritable. Check file
      existance on startup and exit if it isn't present.
      (LP: #946309)
    + Fix test failure in config_update removing a non-existant key.
      Check for it before removal.
 -- Bryce Harrington <email address hidden> Wed, 14 Mar 2012 13:14:31 -0700