Free space in the /boot partition on Ubuntu

Usually you get this error when /boot partition is full or near to full.

You can usually remove old, unused kernels on /boot by running following command –

sudo apt autoremove

There is also an utility purge-old-kernels which also recommends to use sudo apt autoremove command.

After running this command, you can run following command to check the space on /boot.

df -h /boot/