df -hl
sudo apt-get install rsync
sudo mount /dev/nvme0n1p1 /mnt
sudo rsync -aAXv / --exclude={"/dev/","/proc/","/sys/","/tmp/","/run/","/mnt/","/media/*","/lost+found"} /mnt
sudo cp ~/initrd /boot sudo chown root /boot/initrd sudo chgrp root /boot/initrd、 sync
https://blog.csdn.net/qq_38898517/article/details/109116191
https://blog.csdn.net/xuemei0501/article/details/122363474
https://www.jianshu.com/p/045df333042e?from=singlemessage