謝謝！
先說結論，我目前用WIN10+openSUSE 15.2雙系統，且檔案格式以BTRFS爲主。
畢竟openSUSE是最支持BTRFS的LINUX分支。

我一開始不懂ProxmoxVE的好，後來看了下文才知道。
KVM 虛擬化環境搭建 - ProxmoxVE / 韋易笑
https://zhuanlan.zhihu.com/p/49118355
Proxmox VE 的防火牆
http://blog.jason.tools/2019/09/2020-ironman-13.html

Proxmox VE kernel是5.4,但即便用了底下方法，Proxmox抓不到Realtek音效卡，所以虛擬機也抓不到音效卡。
https://xylog.cn/2019/11/13/proxmox-pcie-audio.html

另外，我是在「本機上」裝Proxmox VE，所以虛擬機畫面用1080P時會超出熒幕。
最後，我放棄它。

PS：
個人試用過程：

Proxmox VE的安裝
https://ttnews.xyz/a/5ddf4d1ddc9b5e...61?lang=zh-hant

# 安裝桌面及相關套件 & 新增桌面使用者
## 安裝sudo等工具 (Option)
apt install -y -qq sudo tmux vim htop

## 安裝Gnome桌面環境
tasksel install desktop gnome-desktop

## 移除 network-manager (Option)
apt remove network-manager-gnome network-manager

## 啟用桌面環境
systemctl set-default graphical.target

## 加入使用者
adduser <USERNAME>

## 加入sudo群組(option)
usermod -a -G sudo <USERNAME>

## 重開機
reboot

# 更換 Proxmox VE No-Subscription Repository & 更新系統
## 將enterprise ppa 移出套件庫
mv /etc/apt/sources.list.d/pve-enterprise.list /etc/apt/sources.list.d/pve-enterprise.list.bk

## 將 non-enterprise ppa 加入套件庫
echo "deb http://download.proxmox.com/debian/pve buster pve-no-subscription" > /etc/apt/sources.list.d/pve-no-enterprise.list

## 更新套件清單及系統
apt update -qq && apt upgrade -y -qq

## 重開機
reboot

我在Debian體系的MX LINUX裝過ZFS，但看到錯誤訊息後就放棄。

ZFS on Linux is provided in the form of DKMS source for Debian users
https://openzfs.github.io/openzfs-d...tml#root-on-zfs

[ ok ] Mounting ZFS filesystem(s) .
Processing triggers for libc-bin (2.28-10) ...
Processing triggers for systemd (1:241-7~deb10u5+mx19) ...
Processing triggers for man-db (2.8.5-2) ...
Processing triggers for initramfs-tools (0.133+deb10u1) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-3-amd64
cryptsetup: WARNING: The initramfs image may not contain cryptsetup binaries
nor crypto modules. If that's on purpose, you may want to uninstall the
'cryptsetup-initramfs' package in order to disable the cryptsetup initramfs
integration and avoid this warning.
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_ta.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi10_mes.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_smc.bin for module amdgpu
I: The initramfs will attempt to resume from /dev/sda2
I: (UUID=132d52dc-d257-442c-98a8-3b1433e84dfb)
I: Set the RESUME variable to override this.
root@mx:~#