ppa.md

PPA

PPAs are sources of software.

To add a new source you must do two things:

• add the PPA key to the trusted PPA list
• add the PPA to the PPA list

Find PPAs

Launchpad https://launchpad.net is the main source for PPAs and the site is maintained by Ubuntu. Look there first.

Next Google it.

List added PPAs

Default sources:

cat /etc/apt/sources.list

PPAs:

ls -1 /etc/apt/sources.list.d/

List packages from a PPA

• http://askubuntu.com/questions/5976/how-can-i-list-all-packages-ive-installed-from-a-particular-ppa
• http://askubuntu.com/questions/447129/how-to-list-all-the-packages-which-are-installed-from-ppas
• http://askubuntu.com/questions/5976/how-can-i-list-all-packages-ive-installed-from-a-particular-ppa

Not as easy as it should be.

Keys

In order to trust a PPA, you have to add its key.

This is called a digital signature.

It is meant to ensure that:

• you received the data from who you think you did
• the data was not modified in its way to you

Keys are managed by GPG, and kept in:

gpg /etc/apt/trustdb.gpg

So if you want to really understand things, you must first understand gpg

List keys easily:

apt-key list

add keys:

sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 5044912E

wget:

wget -q -O - http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -

add-apt-repository

Add key to PPAs in Launchpad.

python-software-properties package.

Launchpad is maintained by Canonical, and it is easy to Install/remove packages from them with add-apt-repository.

sudo add-apt-repository ppa:deluge-team/ppa
sudo aptitude update

- `deluge-team` is an username
- ppa is an specific ppa from that username

-y: don't ask for confirmation:

sudo add-apt-repository -y ppa:user/repo

Remove sources:

You could remove them manually, but there it is better to do that with ppa-purge:

sudo aptitude install ppa-purge
sudo ppa-purge ppa:matthaeus123/mrw-gimp-svn

Not sure what is the weight of:

sudo add-apt-repository --remote

PPAs outside launchpad

The best I could find for now to add was the GetDeb way:

wget -q -O - http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -
sudo sh -c 'echo "deb http://archive.getdeb.net/ubuntu quantal-getdeb games" >> /etc/apt/sources.list.d/getdeb.list'

And to remove:

sudo rm /etc/apt/sources.list.d/getdeb.list
apt-key list | less
Pub   4096R/46D7E7CF 2009-05-15
^^^^^^^^
KEY
KEY=
sudo apt-key del "$KEY"

Keep a list of all PPAs added like this somewhere.

If you want to uninstall, you will remember the filename to remove.