在进入 Ubuntu 调整之前，需要先在 Pool 中将该 ZVol 的可占用空间调大，我这里已经调到了 200GB
Refer to https://swsmile.info/post/linux-not-enough-space/
如果碰到这个，选 Fix：
$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 394M 992K 393M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 96G 11G 82G 12% /
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda2 976M 300M 609M 34% /boot
/dev/sda1 511M 5.3M 506M 2% /boot/efi
/dev/loop1 56M 56M 0 100% /snap/core18/2128
/dev/loop2 62M 62M 0 100% /snap/core20/1081
/dev/loop0 56M 56M 0 100% /snap/core18/2074
/dev/loop3 62M 62M 0 100% /snap/core20/1169
/dev/loop4 33M 33M 0 100% /snap/snapd/13170
/dev/loop5 33M 33M 0 100% /snap/snapd/13270
/dev/loop6 71M 71M 0 100% /snap/lxd/21029
/dev/loop7 68M 68M 0 100% /snap/lxd/21545
tmpfs 394M 0 394M 0% /run/user/1000
值得注意的是，当扩容到 96GB 后，该 VM 在 TrueNAS Pool 中空间占用为实际的空间占用（即 12GB），而不是 96GB。
Reference
- https://www.truenas.com/community/threads/howto-increase-ubuntu-vm-disk-size.54559/
- https://www.truenas.com/community/resources/howto-resize-a-linux-vms-llvm-virtual-disk-on-a-zvol.174/
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