Proxmox 更新出现故障的解决方法

1） 用 apt-get 命令进行更新时出现 public key 错误
例如： Reading package lists… Done
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906
W: There is no public key available for the following key IDs:
7638D0442B90D010

解决：
#apt–get install debian–keyring debian–archive–keyring
#apt-update