安装完成后的优化工作
完成上面的步骤后，Ubuntu18.04 就可以正常使用了。但是为了更加方便快捷的使用，建议再对装好的 Ubuntu 系统做以下的更改。
1.更换软件源
这里只给出步骤，详细的讲解请点我访问
Ubuntu 官方源服务器在欧洲，国内访问很慢。所以这里有必要将软件源更换为国内的源,
国内源很多，在这里我们选择阿里云与清华大学的 Ubuntu 源
# 阿里云源 deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse ##測試版源 deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse # 源碼 deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse ##測試版源 deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse # 清华大学源 deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse ##測試版源 deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse # 源碼 deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse ##測試版源 deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse123456789101112131415161718192021222324252627282930
Ubuntu 的源存放在在 /etc/apt/ 目录下的 sources.list 文件中，修改前我们先备份，在终端中执行以下命令：
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bcakup
然后执行下面的命令打开 sources.list 文件，清空里面的内容，把上面阿里云与清华大学的 Ubuntu 源复制进去，保存后退出。
sudo gedit /etc/apt/sources.list
接着在终端上执行以下命令更新软件列表，检测出可以更新的软件：
sudo apt-get update
最后在终端上执行以下命令进行软件更新：
sudo apt-get upgrade
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