apt-get update が404になり失敗する問題 Ubuntu 17.04 で apt-get update をしたところ、大量の404エラーが出てしまった。 その後、 apt-get install や upgrade も404で失敗する現象に遭遇した。 $ sudo apt-get update Err:11 http://jp.archive.ubuntu.com/ubuntu zesty/universe Sources 404 Not Found Ign:12 http://jp.archive.ubuntu.com/ubuntu zesty/multiverse Sources Ign:13 http://jp.archive.ubuntu.com/ubuntu zesty/main Sources Err:14 http://jp.archive.ubuntu.com
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