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Stuck running Ubuntu 16.04 LTS on a Lenova desktop with a small boot partition now with 0(zero) bytes after many upgrades. Currently at 4.4.0-71-generic but new upgrades fail. Have tried suggestions from many "solutions" but still can not upgrade.

None of the following free-up space:

sudo apt-get clean

sudo apt autoremove --purge

sudo apt-get autoremove --purge

sudo purge-old-kernels

sudo apt autoremove

sudo apt-get purge linux-image-4.4.0-67

Have also purged all the other old linux-images that do not have dependencies.

Any new suggestions?