I just wanted to delete all tags set in my Applications folder on OS X and had to look up how to accomplish that in the Terminal since it a) is quite cumbersome to do it in Finder and b) it did not quite work somehow.
My Disqus module did not seem to work any longer (the comments no longer showed up in the blog posts). I ﬁxed it hopefully by reinstalling the Disqus module, updating the Libraries API module to version 2.x (and then reconﬁguring the Disqus module).
After I upgraded OwnCloud, I got the following error message when trying to enable the Calendar or Contacts plugins:
cURL error 60: SSL certificate problem: unable to get local issuer certificate