How do I install .deb file?
You need to use dpkg package manager from shell/command prompt. dpkg is a tool to install, build, remove and manage packages. dpkg itself is controlled entirely via command line parameters. For example -i use to install .deb file.
To install package called package.deb type the following command:
Go to directory where package.deb is kept. For example if it is in /tmp directory:
(找到.deb文件的所在位置，比如說在/tmp目錄下，於是我們用下面的語言，cd是change directory的縮寫,就是把我們的命令鎖定在這一個/tmp目錄下)
$
cd /tmp
Type the following command:
（然後用下面的命令，package.deb換成我們下載的東西的名字，就是XXX.deb，這裏有一個小竅門，可以用tab鍵讓系統對命令進行自動補全哦~）
$
sudo dpkg -i package.deb