I followed several tutorials-which all appeared to say the same thing-on how to create deployable flat-packages (.pkg) using the OS X system provided pkgbuild tool. The packages was always generated just fine. They did, however, not want to be installed.
Running the graphical Apple Installer or the command line interface installer aborted the installation early on giving an generic “Unknown error” after prompting for higher permissions.
Hours later after closer investigation I discovered that I could not install other packages either. Not even updates and new installations from the OS X App Store. Why could I not install my own nor any other packages? What was going on?
The installer daemon service itself is unresponsive. Force quit the installed program from from the Activity Monitor, or from the command line with
sudo killall installd.