First check the kernel version, so we won’t delete the kernel image in use:
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uname -r |
List installed kernels:
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dpkg --list 'linux-image*' | grep ^ii |
Delete unnecessary kernels (replace the VERSION with kernel that should be removed):
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sudo apt-get remove linux-image-VERSION |
After old kernels are removed, you can remove packages that are not used anymore:
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sudo apt-get autoremove |
Finally update grub kernel list:
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sudo update-grub |