Insufficient /boot W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.

Sometimes when updating the system, errors such as: W: mdadm: /etc/mdadm/mdadm.conf defines no arrays., W: mdadm: no arrays defined in configuration file. What should I do? Generally speaking, it is caused by insufficient space in the /boot partition. The most likely reason is that upgrading the kernel causes multiple versions to be occupied. We only need to clean up the unused kernel files. Solution:

First check which cores are there:

dpkg -l ‘linux-image-*’ | grep ‘^ii’ or dpkg –get-selections | grep linux-image

For example, on my VPS:

root@server-jp:~# dpkg –get-selections |grep linux-image

linux-image-4.10.1-041001-generic install

linux-image-4.4.0-21-generic install

linux-image-4.4.0-53-generic install

linux-image-4.4.0-64-generic install

linux-image-extra-4.4.0-21-generic install

linux-image-extra-4.4.0-53-generic install

linux-image-extra-4.4.0-64-generic install

linux-image-generic install

You can also use the "ls /boot" command to check what files are in /boot:

ls /boot

To uninstall the old kernel, the command is as follows:

sudo apt-get purge Linux-image-3.5.0-17-generic

Note: The green ones at the back are those that need to be uninstalled. You can respond to your own needs and only keep what you need to keep!

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