Sometimes the update system will appear: 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 biggest possibility is that multiple versions are occupied by the kernel upgrade. We only need to clean up the unused kernel files. Solution:

First check which kernels are available:

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 view which files are in /boot:

ls /boot

Uninstall the old kernel, the command is as follows:

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

Note: The green ones are to be uninstalled, everyone corresponds to your own, only keep what you need to leave!

at 12/06/2020, 18:25pm

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