In you df file we can see that /tmp is full:
tmpfs 1024 1024 0 100% /tmp
** Also affects: apport (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/972933
Title:
package initramfs-tools 0.99ubuntu12 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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