转载自https://www.pkbill.com/3731/
删除企业源
rm -rf /etc/apt/sources.list.d/pve-enterprise.list
添加社区源
echo "deb http://download.proxmox.wiki/debian/pve stretch pve-no-subscription" >/etc/apt/sources.list.d/pve-install-repo.list
使用国内debian源及非订阅用户屏蔽企业源
打开/etc/apt/sources.list
替换如下
deb http://ftp.debian.org/debian buster main contrib
deb http://ftp.debian.org/debian buster-updates main contrib
# PVE pve-no-subscription repository provided by proxmox.com,
# NOT recommended for production use
deb http://download.proxmox.com/debian/pve buster pve-no-subscription
# security updates
deb http://security.debian.org/debian-security buster/updates main contrib
#aliyun
deb http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb http://mirrors.aliyun.com/debian-security buster/updates main
deb-src http://mirrors.aliyun.com/debian-security buster/updates main
deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
执行更新升级命令
apt update&&apt dist-upgrade```
大概会下载700M的更新包，根据提示操作即可。更新完后
```reboot```