Ubuntu Add Delete PPA source

In Ubuntu, the PPA represents an unstable version to the release, and likes to try fresh people to add a lot of PPA sources.

About PPA to detailed instructions, you can refer to Https://help.launchpad.net/Packaging/PPA

Describes two commands for adding and removing PPA sources

Add a PPA source

sudo add-apt-repository ppa:user/ppa-name

such as adding cairo-dock to weekly update source

sudo add-apt-repository ppa:cairo-dock-team/weekly/ubuntu

Delete a PPA source

1, to the source directory: cd/etc/apt/sources.list.d/

2, you can see the file on the source, delete can be.

Instance: Incorrect installation of the PPA causes each update source to download the last occurrence of a large failure,

For example, execute the following command: sudo apt-get update appears with the following error: Error http://ppa.launchpad.net lucid/main Packages 404 Not Found

W: Cannot download http://ppa.launchpad.net/wengxt/fctix-nightly/ubuntu/dists/lucid/main/binary-i386/Packages.gz 404 Not Found follow the above method to delete the line
http://lightdm.lofter.com/post/459eb_6951a

Adding a PPA after the

Ubuntu9.10 and 9.10 is simple, as long as a single command is available:
sudo add-apt-repository ppa:user/ppa-name
ppa:user/ Ppa-name Replace with the to be added

to Ubuntu-tweak:
first into the Ubuntu PPA home page:
Https://launchpad.net/ubuntu/+ppas