Proxmox Kernel upgrade gets No space left on device

方法一
mkdir /tmp/myesp
cat /etc/kernel/proxmox-boot-uuids
mount  /dev/disk/by-uuid/$(cat /etc/kernel/proxmox-boot-uuids) /tmp/myesp

rm /tmp/myesp/*-pve
umount /tmp/myesp

方法二
:> /boot/file