While updating my OS, it gives an error - "The upgrade needs a total of 102 M free space on disk '/boot'. Please free at least an additional 42.3 M of disk space on '/boot'. You can remove old kernels using 'sudo apt autoremove', and you could also set COMPRESS=xz in /etc/initramfs-tools/initramfs.conf to reduce the size of your initramfs."
How to resolve it?
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