I ran into the exact same problem, easily fixed it by cleaning up some old files from my boot partition.
I'm guessing you also need to clear up some space in your boot partition. According to Df.txt you have around 18Mb free, while (my) initrd.img is around 20 Mb. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/772563 Title: package initramfs-tools 0.98.8ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs