I got the same error on my system when running 
apt-get install --reinstall initramfs-tools

By running
apt-get install initramfs-tools
it complained of not being able to create a file called 
/var/tmp/mkinitramfs-FW_XXXXXX
This was because the folder
/var/tmp
didn't exist... I recreated that and both commands above worked fine again

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https://bugs.launchpad.net/bugs/1388353

Title:
  package initramfs-tools 0.103ubuntu4.2 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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