W: GPG error: https://mirrors.ustc.edu.cn/proxmox/debian/pve stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0D9A1950E2EF0603

错误:
W: GPG error: https://mirrors.ustc.edu.cn/proxmox/debian/pve stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0D9A1950E2EF0603

原因:
更换三方源没有对应的Key

解决:
直接执行如下命令,比如我没有 3B4FE6ACC0B21F32,就需要执行

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0D9A1950E2EF0603

重新执行apt update问题解决

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