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[joosteto <joosteto@xxxxxxxxx>]

Many thanks to Peter Teuben, and for finding that the cause of the 'permission denied' actually is the symlink from /usr/share to /home.
I can say the symlink also causes cups to fail in Ubuntu 14.04 (Trusty Tahr)

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https://bugs.launchpad.net/bugs/1215733

Title:
  cups config files cannot deal with symlinks and/or other filesystems

Status in “cups” package in Ubuntu:
  Confirmed

Bug description:
  I needed to make space on / to upgrade my ubuntu, and since /usr/share
  is huge (4GB in my case), decided to clone this on /home/share and let
  /usr/share -> /home/share.

  I then found cups failed to work, there were messages such as 
      Unable to open "/usr/share/cups/mime": Permission denied
  in /var/log/cups/error_log, which eventually gave me the hint what was going on here.

  Also, looking at properties of a printer, the "print test page" button was greyed out, I could not print a test page. This turned out the easiest way for me to debug this problem (at least graphically). After the fixes (see below) and "service cups restart" I would
  see the "print test page" button again.

  To differentiate between a symlink and other-filesystem as the root
  cause, I decided to experiment:

  1) I kept /usr/share.d  and did /usr/share -> /usr/share.d  
      This failed, so this pointed to the fact that it's a symlink that was not allowed by CUPS, since /usr/share.d  was  on /

      but then it surprised me:

  2) I kept /usr/share  but now /usr/share/cups  -> /usr/share/cups.d
  worked, despite that it was a symlink.

  3)   Of course, i confirmed that /usr/share/cups -> /home/cups.d
  indeed failed. So,other filesystem is always a fail.

  I'm left with this weird puzzle, why CUPS doesn't quite allow a simple symlink 1) or even 3)   It seems this is against the unix
  philosphy and certainly burnt me and caused me a good fraction of a day of work.

  This could very well be a problem on apple's as well, but I have no
  easy access to one to test this.

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