今天试图把 deepin 的软件源加到我到 Ubuntu 16.04 中去。

在 deepin wiki 上看到一个教程。

在 /etc/apt/sources.list 中加上 deepin 的软件源之后，执行 sudo apt update 报错：

Err:3 http://packages.deepin.com/deepin unstable InRelease

  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 425956BB3E31DF51

搜索一番，发现一个办法

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys　425956BB3E31DF51

再次执行　sudo apt update　就不会报错了。

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