我是linux和hadoop的新手。我想学习pig、mapreduce和hive的基础知识，并尝试在ubuntu上安装cloudera的hadoop解决方案。这是我下面的教程。我被困在第一步了。我没有使用代理，所以跳过了代理配置步骤。转到步骤1.6，然后我得到以下错误消息。你知道我该怎么做吗？

Refreshing repository metadata failed. See /var/log/cloudera-manager-installer/2.refresh-repo.log for details. Click OK to revert this installation.

这就是日志文件上的内容：

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.