How to remove old kernels from Ubuntu

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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-generic 4.4.0-78.99  amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-79-generic 4.4.0-79.100 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

 3. Deleting the kernels that you don't need using apt-get:

 sudo apt-get purge linux-image-x.x.x-xx-generic
4. Updating Grub:

 sudo update-grub2
5. Reboot the system

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