apt在更新内核的时候不会移除旧版本内核。随着内核的不断更新，新的内核装进来，老的内核不会被删除，于是默认只有不到500MiB的/boot 慢慢变得不堪重负，塞满了内核和initrd。终于有一天，你在愉快地apt update && apt full-upgrade 的时候遇到了这样的错误：

gzip: stdout: No space left on device
E: mkinitramfs failure cpio 141 gzip 1
update-initramfs: failed for /boot/initrd.img-4.10.0-37-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
dpkg: error processing package linux-image-extra-4.10.0-37-generic (--purge):
 subprocess installed post-removal script returned error exit status 1
Removing linux-image-extra-4.10.0-40-generic (4.10.0-40.44~16.04.1) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
update-initramfs: Generating /boot/initrd.img-4.10.0-40-generic

那么让我们试试修复这台服务器。

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