Ubuntu 8.04 LTS RC之升级手册

Ubuntu 8.04 LTS RC本计划于今日发布,不过因为软件包打包的一个小问题,要延误一天.
这只是针对全新安装的用户来说的,假如你只是想将原有的Ubuntu系统升级至最新的Ubuntu 8.04 LTSTS,那么你可以开始行动了!因为网络上已经准备好了!本文是从Ubuntu 7.10下进行升级,Ubuntu 7.04、Ubuntu6.10等系统类似.



一、准备工作
在升级至Ubuntu 8.04 RC时，请确保你备份了重要文件，以避免升级失败带来的损失。
另外请保证根目录有大量剩余空间（至少2GB以上），因为升级过程中将下载大量新版本的软件包（视你原系统的软件包数量），最后，保证网络畅通即可。
二、开始升级
打开你的终端，输入update-manager -c -d（不需要sudo），然后“更新管理器”即会启动，进行发行版的检测。如果正常的话，将会显示“新发行版 ‘8.04 LTS’ 可用”。如下图：
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点击“升级”后，将会弹出发布说明，你会看到你升级的目标，Ubuntu 8.04 Hardy Heron 的Release Candidate，确认后，再点“升级”。

接下来都是比较智能的升级过程，只有很少的交互动作。
需要注意的是，在获取完新的软件包，开始安装之前，你随时可以“取消”升级，如果一旦软件包下载完毕开始升级了，你就不能再取消了。
更新升级工具，从网上下载最新的升级工具，以确保升级顺利
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准备升级
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如果你事先没有修改过sources.list的话，将会出现下面的对话框，毫无疑问，选择“是”，这样软件源都将更新为hardy的版本。
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自动设定完源后，就开始更新软件频道，相当于我们在终端下执行apt-get update。

更新完后会有软件包支持方面的提示
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经过短暂的计算以后，更新管理器将会显示升级的详细信息，包括将被删除的软件包，将新进的软件包和将升级的软件包。
值得注意的是，大概是中文翻译的问题，升级的时间是有误的。应该是2小时0分，它居然显示2天0小时，这个错误从6.10开始就被“继承”下来了。
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接着就开始获取新的软件包了，这是你最后能后悔的时候，不想升级就点“取消”吧。过了这里就要跟旧的Ubuntu说拜拜了，当然你也可以强制重启来取消升级。
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经过了“1天28小时”以后，软件包获取完毕，正式开始升级。这次显示正常了，依软件包的数量，大概需要30分钟到1个小时之间。
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经过了又一段漫长的等待，终于快安装完成了，最后一个步骤是：清理废旧软件包。
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确保列表里的软件包你都不需要了，然后移除吧！

不要犹豫了，现在就重启吧！
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假如，一切顺利的话！重启后，登入你的帐户，全新的Firefox 3将会自动打开，并以Welcome to Ubuntu 8.04 LTS的主页来欢迎你！
恭喜你进入Ubuntu 8.04的世界！
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后记：
我自Ubuntu 6.10开始使用Ubuntu，每当新版本发布时，我也都采用这种升级方式。不过从6.10到7.04，从7.04到7.10的两次升级，均未成功过，只好完全重装。
不过这次从7.10升级至8.04，非常顺利，升级后的系统非常稳定，之前所有的应用都完整的继承了下来（Apache2、Mysql等）。
不知能否说明Ubuntu的版本升级功能越来越完善了呢？还有待大家的考验！