大家好,又见面了,我是你们的朋友全栈君。
W: GPG error: http://mirror.bjtu.edu.cn precise/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
W: Failed to fetch http://cran.rstudio.com/bin/linux/ubuntu/maverick/Packages 404 Not Found [IP: 54.230.73.11 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
hadoop@ubuntu:~$ gpg --keyserver pgpkeys.mit.edu --recv-key 51716619E084DAB9(这个16进制的数字串就是上边错误提示中NO_PUBKEY 51716619E084DAB9)
gpg: requesting key E084DAB9 from hkp server pgpkeys.mit.edu
gpg: key E084DAB9: public key "Michael Rutter <marutter@gmail.com>" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
hadoop@ubuntu:~$ gpg -a --export 51716619E084DAB9| sudo apt-key add -
OK
hadoop@ubuntu:~$ sudo apt-get update(重新update)
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