Upgrading Ubuntu to 14.04 “not enough free disk space” on ‘/boot’

While upgrading Ubuntu to 14.04 you receive the error “not enough free disk space” on ‘/boot’ you need at least 57m free.

Check your space:

fdisk -l &&df -h

List unused images:

dpkg -l | grep linux-image

The fix, this removes all unused kernels:

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/(.*)-([^0-9]+)/1/")"'/d;s/^[^ ]* [^ ]* ([^ ]*).*/1/;/[0-9]/!d' | xargs sudo apt-get -y purge

Check space, reboot and rerun upgrade:

fdisk -l &&df -h

Ubuntu Cleanup: How to Remove All Unused Linux Kernel Headers
Can’t upgrade due to low disk space on /boot

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