ubuntu 18.04更新snap慢或者失败

$ sudo snap install snap-store

$ sudo snap install snap-store-proxy 

$ sudo snap install snap-store-proxy-client

# 更新已经安装的软件
$ sudo snap refresh

$ sudo snap install snap-store

$ sudo snap install snap-store-proxy

$ sudo snap install snap-store-proxy-client

# 更新已经安装的软件

$ sudo snap refresh

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