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With the default gzip compression the 60 MB limit for the vmlinuz bundle of kernel+initramfs was reached. The limit comes from the size of the /boot partition which is 128 MB large and the kernel needs to fit twice, in addition to GRUB. Use zstd for the initramfs as it provides a similar speed but better compression. For the kernel we can't switch yet to zstd for arm64 but for amd64 it works.