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How to remove old kernels from Ubuntu

This method should work for both Ubuntu server OS (instances) and desktops that we use.
Use case: Automatic or manual updates to the OS may result in multiple kernels installed in your system. This is usually alright, but it can become a problem if your the OS has a small /boot partition, and it runs out of space because of a large number of old kernels installed there. You could follow these simple steps to delete the older kernels
1. Verify the kernel that is currently booted and is in use:

uname -r
4.4.0-79-generic
Whatever you do, don't delete this kernel.

2. Finding out what kernels are currently installed in the system:

dpkg —list | grep linux-image linux-image-4.4.0-72-generic 4.4.0-72.93 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP linux-image-4.4.0-75-generic 4.4.0-75.96 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP linux-image-4.4.0-77-generic 4.4.0-77.98 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP linux-image-4.4.0-78-gener…