The upgrade needs a total of 99.7 M free space on disk '/boot'.
Please free at least an additional 53.7 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.
按照如下圖示，執行命令：
- $ cd /boot/
- $ dpkg -l | grep linux-image #查看你機器上所有的內核
- $ uname -a #查看你當前所使用的內核
- $ sudo apt-get purge --remove 你沒有使用的內核名稱
