Error in Line X of "/etc/APT/sources. List" of ubuntu installation source configuration file

This error occurs because the source obtained in the sources. list file is incorrect.

Find the file and open the file. We can comment out the problematic lines in it, or simply replace all the source files.

A 163 source is provided as follows:

Deb http://mirrors.163.com/ubuntu/ natty main universe restricted multiverse
The Deb-Src http://mirrors.163.com/ubuntu/ natty main universe restricted multiverse
Deb http://mirrors.163.com/ubuntu/ natty-security universe main multiverse restricted
Deb-Src http://mirrors.163.com/ubuntu/ natty-security universe main multiverse restricted
Deb http://mirrors.163.com/ubuntu/ natty-Updates universe main multiverse restricted
Deb http://mirrors.163.com/ubuntu/ natty-Proposed universe main multiverse restricted
The Deb-Src http://mirrors.163.com/ubuntu/ natty-Proposed universe main multiverse restricted
Deb http://mirrors.163.com/ubuntu/ natty-backports universe main multiverse restricted
Deb-Src http://mirrors.163.com/ubuntu/ nat-backports universe main multiverse restricted
Deb-Src http://mirrors.163.com/ubuntu/ Nat-Updates universe main multiverse restricted

Then run$ Sudo apt-Get updateCommand to obtain the source again

To add a source address using the command line, follow these steps:

$ Sudo add-Apt-repository & quot; Deb http://cn.archive.ubuntu.com/ubuntu/jaunty multiverse & quot"

$ Sudo add-Apt-repository & quot; Deb http://cn.archive.ubuntu.com/ubuntu/jaunty-updates multiverse & quot"

$ Sudo apt-Get update

Note that the source address above needs to be modified according to your needs.