ubuntu upgrade problem

出现问题：

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ppa.launchpad.net_webupd8team_java_ubuntu_dists_precise_main_binary-i386_Packages Hash Sum mismatch

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.

解决方法：

sudo rm -rf /var/lib/apt/lists/*

sudo rm -rf /var/lib/apt/lists/partial/*

sudo apt-get clean

sudo apt-get update

sudo apt-get update -o Acquire::No-Cache=True

sudo apt-get update -o Acquire::BrokenProxe=True

sudo rm -vf /var/lib/apt/lists/*

如果以上均无法解决，建议用官方源。然后搭个goagent（搭建方法利用GAEFQ教程 - appifan.com ）。然后用sudo apt-get -o Acquire::http::proxy="http://127.0.0.1:8087/" update，进行更新。用代码更新。更新完再sudo apt-get upgrade。国内的源经常出现一些问题，官方源虽然慢了些，但基本不出错。

在 /etc/environment 中添加环境变量http_proxy="http://127.0.0.1:8087/"（在图形界面配置一样配置，在network中配置）

然后开始升级了。首先，输入以下命令：

sudo apt-get install update-manager-core
而后修改 /etc/update-manager/release-upgrades
进行简单的编辑，将Prompt的值改为normal（其实就是使用图形界面的update，配置一下更新方式）

保存文件，执行命令
sudo do-release-upgrade -d

转载于:https://www.cnblogs.com/tmacy/p/3384894.html

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