PVE安装完毕后，会自动添加一个企业存储库的订阅，但如果您是免费用户，在使用apt-get update更新软件的时候会出现401错误，错误内容如下：
Err:7 https://enterprise.proxmox.com/debian/pve buster InRelease
401 Unauthorized [IP: 51.79.159.216 443]
Reading package lists... Done
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/buster/InRelease 401 Unauthorized [IP: 51.79.159.216 443]
E: The repository 'https://enterprise.proxmox.com/debian/pve buster InRelease' is not signed.解决办法
备份原有的存储库：
mv /etc/apt/sources.list.d/pve-enterprise.list /etc/apt/sources.list.d/pve-enterprise.list.bak然后修改/etc/apt/sources.list在末尾添加免费的存储库：
#适用于PVE 6.x
deb http://download.proxmox.com/debian/pve buster pve-no-subscription
#适用于PVE 7.x
deb http://security.debian.org/debian-security bullseye-security main contrib最后再更新即可：apt-get update
此文部分内容参考了：Package Repositories
