according to your dpkg log the used root partition is too small and thus
the upgrade could not proceed:
lzma: Encoder error: -2147467259
please use a bigger partition for the future or if not possible deinstall stuff
to free some space.
** Changed in: initramfs-tools (Ubuntu)
Status: Incomplete => Invalid
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package initramfs-tools 0.98.1ubuntu6 [modified: usr/sbin/update-initramfs]
failed to install/upgrade: subprocess installed post-installation script
returned error exit status 1
https://bugs.launchpad.net/bugs/661455
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