Clear boot partitions in Ubuntu

During the upgrade of Ubuntu to clean up boot partitions today, an error was reported: I allocated 256 MB to boot, and the system kernel was mounted to the boot partition, therefore, I need to clear the boot partition and view the existing kernel [html] dpkg -- get-selections | greplinux-image of the system. The figure is as follows: check... clear boot partitions in Ubuntu

Problem

At the time of today's update, an error is reported:


Because I allocated 256 m to boot and installed the system kernel in the boot partition, I need to clear the boot partition.

View the existing kernel of the system [html] dpkg -- get-selections | grep linux-image
The figure is as follows:


View the currently used kernel [html] uname-
The figure is as follows:

Clear/boot partitions
The main idea is to selectively delete the kernel that you do not want to continue using. after clearing the/boot partition space, you can [html] sudo apt-get purge kernel name.

Cleanup of residual files
Clear the/usr/src directory and delete the unmounted kernel directory.