gpg: keyserver timed out

在更新 gcc版本的时候

需要用到这个指令：

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

然而它报了下面这个错误：

gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
gpg: keyserver timed out
gpg: keyserver receive failed: keyserver error

实际上再次运行就可以了。

看到这样的结果就成功了

gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
gpg: key BA9EF27F: public key "Launchpad Toolchain builds" imported
gpg: key BA9EF27F: public key "Totally Legit Signing Key <mallory@example.org>" imported
gpg: Total number processed: 2
gpg:               imported: 2  (RSA: 2)

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