Comment 3 for bug 1671392

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Benjamin Drung (bdrung) wrote : Re: package linux-image-extra-4.4.0-66-generic 4.4.0-66.87 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

Thank you for taking the time to report this bug and helping to make Ubuntu better. The relevant dpkg terminal log says:

gzip: stdout: No space left on device

df log says:

Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda7 464808 450080 0 100% /boot

So generating the initramfs fails because your boot partition is full. Please cleanup your boot partition. Feel free to continue to report any other bugs you may find.