我是 Linux 和 Hadoop 的新手。我想学习 Pig、MapReduce 和 Hive 的基础知识，我正在尝试在 Ubuntu 上安装 Cloudera 的 Hadoop 解决方案。 这是我正在关注的教程。我被困在第 1 步。我没有使用代理，所以我跳过了代理配置步骤。转到步骤 1.6，然后我收到以下错误消息。有什么想法我应该尝试吗？
Refreshing repository metadata failed. See /var/log/cloudera-manager-installer/2.refresh-repo.log for details. Click OK to revert this installation.
这就是该日志文件中的内容：
Hit http://archive.cloudera.com precise-cm4 Release.gpg
Hit http://archive.cloudera.com precise-cm4 Release
Ign http://ppa.launchpad.net precise Release.gpg
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://archive.ubuntu.com precise Release.gpg
Hit http://archive.ubuntu.com precise-updates Release.gpg
Hit http://security.ubuntu.com precise-security Release.gpg
Hit http://archive.cloudera.com precise-cm4/contrib Sources
Ign http://ppa.launchpad.net precise Release
Hit http://archive.cloudera.com precise-cm4/contrib amd64 Packages
Ign http://archive.cloudera.com precise-cm4/contrib TranslationIndex
Hit http://archive.ubuntu.com precise Release
Hit http://security.ubuntu.com precise-security Release
Hit http://ppa.launchpad.net precise Release
Hit http://archive.ubuntu.com precise-updates Release
Hit http://security.ubuntu.com precise-security/main amd64 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/main amd64 Packages
Hit http://archive.ubuntu.com precise/restricted amd64 Packages
Hit http://archive.ubuntu.com precise/universe amd64 Packages
Hit http://archive.ubuntu.com precise/multiverse amd64 Packages
Hit http://archive.ubuntu.com precise/main i386 Packages
Hit http://security.ubuntu.com precise-security/restricted amd64 Packages
Hit http://security.ubuntu.com precise-security/universe amd64 Packages
Hit http://security.ubuntu.com precise-security/multiverse amd64 Packages
Hit http://security.ubuntu.com precise-security/main i386 Packages
Hit http://security.ubuntu.com precise-security/restricted i386 Packages
Hit http://security.ubuntu.com precise-security/universe i386 Packages
Hit http://security.ubuntu.com precise-security/multiverse i386 Packages
Hit http://security.ubuntu.com precise-security/main TranslationIndex
Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://security.ubuntu.com precise-security/restricted TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/restricted i386 Packages
Hit http://archive.ubuntu.com precise/universe i386 Packages
Hit http://archive.ubuntu.com precise/multiverse i386 Packages
Hit http://archive.ubuntu.com precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise/restricted TranslationIndex
Hit http://archive.ubuntu.com precise/universe TranslationIndex
Hit http://security.ubuntu.com precise-security/universe TranslationIndex
Hit http://archive.ubuntu.com precise-updates/main amd64 Packages
Hit http://archive.ubuntu.com precise-updates/restricted amd64 Packages
Hit http://archive.ubuntu.com precise-updates/universe amd64 Packages
Hit http://archive.ubuntu.com precise-updates/multiverse amd64 Packages
Hit http://archive.ubuntu.com precise-updates/main i386 Packages
Hit http://archive.ubuntu.com precise-updates/restricted i386 Packages
Hit http://security.ubuntu.com precise-security/main Translation-en
Hit http://security.ubuntu.com precise-security/multiverse Translation-en
Hit http://archive.ubuntu.com precise-updates/universe i386 Packages
Hit http://archive.ubuntu.com precise-updates/multiverse i386 Packages
Hit http://archive.ubuntu.com precise-updates/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-updates/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex
Hit http://archive.ubuntu.com precise/main Translation-en
Hit http://archive.ubuntu.com precise/multiverse Translation-en
Hit http://archive.ubuntu.com precise/restricted Translation-en
Ign http://archive.cloudera.com precise-cm4/contrib Translation-en_US
Hit http://security.ubuntu.com precise-security/restricted Translation-en
Ign http://archive.cloudera.com precise-cm4/contrib Translation-en
Hit http://archive.ubuntu.com precise/universe Translation-en
Hit http://security.ubuntu.com precise-security/universe Translation-en
Hit http://archive.ubuntu.com precise-updates/main Translation-en
Hit http://archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://archive.ubuntu.com precise-updates/universe Translation-en
Err http://ppa.launchpad.net precise/main Sources
404 Not Found
Err http://ppa.launchpad.net precise/main amd64 Packages
404 Not Found
Err http://ppa.launchpad.net precise/main i386 Packages
404 Not Found
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.