apt-get install oracle-java8-installer时Err:7 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main amd64 Packages 404 not found

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apt-get install oracle-java8-installer时Err:7 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main amd64 Packages 404 not found

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ubuntu apt update时W: GPG error http://ppa.launchpad.net lucid Release没有公钥无法验证NO_PUBKEY签名问题解决

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