sudo apt-get install ethereum遇到E: Failed to fetch http://ppa.launchpad.net/, Unable to fetch some等
在Ubuntu上搭建以太坊环境时，每次到sudo apt-get install ethereum这一步都会变得巨卡无比，并且经常遇到这个问题： Err:1 http://ppa.launchpad.net/ethereum/ethereum/ubuntu bionic/main amd64 bootnode amd64 1.9.10+build21009+bionic Connection
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