用到的脚本来自
https://github.com/bohanyang/debi

1. Download
   Download the script with curl:
   curl -fLO https://raw.githubusercontent.com/bohanyang/debi/master/debi.sh

for IPv6-only machines

curl -fLO --resolve 'raw.githubusercontent.com:443:2a04:4e42::133' https://raw.githubusercontent.com/bohanyang/debi/master/debi.sh

2. Run
   Run the script under root or using sudo:
   chmod a+rx debi.sh
   sudo ./debi.sh --architecture arm64
3. Reboot
   If everything looks good, reboot the machine:
   sudo shutdown -r now

实测成功，新建实例时选的 ubuntu 20.4，非 mini 版