每当我尝试使用终端安装程序时，都会收到此错误：
home@ubuntu:~$ apt-get install myunity
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
我也无法使用终端安装更新。
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main gnome-control-center-data all 1:3.4.2-0ubuntu0.2
Connection failed [IP: 91.189.92.183 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main gnome-settings-daemon amd64 3.4.1-0ubuntu1.1
Connection failed [IP: 91.189.92.188 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main libgnome-control-center1 amd64 1:3.4.2-0ubuntu0.2
Connection failed [IP: 91.189.92.192 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main gnome-control-center amd64 1:3.4.2-0ubuntu0.2
Connection failed [IP: 91.189.88.22 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main mahjongg amd64 1:3.4.1-0ubuntu2
Connection failed [IP: 91.189.88.25 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main gnomine amd64 1:3.4.1-0ubuntu2
Connection failed [IP: 91.189.88.28 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main gnome-sudoku all 1:3.4.1-0ubuntu2
Connection failed [IP: 91.189.92.151 80]
Err http://archive.ubuntu.com/ubuntu/ precise-updates/main …