aptlaunchpadppa
There is a project that I want to install on my host:
https://launchpad.net/ubuntu/xenial/amd64/libguestfs-tools/1:1.28.12-1ubuntu2
How to figure out information for add-apt-repository command using the project description given in the mentioned page ?
PPAs in Launchpad are connected to People/Teams, rather than projects. Your best bet is to click on the "Maintainer" for the project ("Cardapio Team" in this case):
From there, follow the link on under "Personal Package Archives" on their profile page. There may be multiple options here, you'll just have to use your best guess based on their names.
The name of the PPA will be on this page:
However, this is not guaranteed to work, as the developers can use any PPA they want for their project. It could be ppa:someunrelatedteam/foobar for all you know. There is no way to know for sure from the Launchpad project.
Alternatively, googling "[project name] PPA" tends to give good results.
You can not add Launchpad itself as a source but you can add specfic PPA's sources for packages.
For instance the Launchpad Project Old and New Python Versions has a PPA settings block where it details the information needed to add that PPA to your software sources
By doing so, the packages listed on this page will be made available to you.
If you can figure out what DEB goes first here is a list of all the DEBs you need for python 2.5: packages Open the 'python2.5 - 2.5.5-8~ppa2~natty3' and you get to see all the DEBs involved!
Best Answer
You don't need a PPA for that, the package you are mentioning is part of the official Ubuntu repositories, more precisely the
universerepository for Xenial.This can be verified using the command
apt policy libguestfs-tools, which should directly display you that package from thexenial/universerepo as installation candidate.Installing it then is as simple as
You know that a package on Launchpad is part of the official Ubuntu repositories if the author (see the big headline right at the top of the page, with the icon) is "Ubuntu" and not any Launchpad user name. The URL starts with
/ubuntuas well for packages from the official repos.As you specified an older version in your link, which got updated and is no longer existing in the official repositories, you have no real way of still getting that old version from any repository or PPA.
The Ubuntu repos do not keep old replaced versions of packages around and there also is no Launchpad PPA where they get automatically available. You can download the package directly from the link given on that site, but there will be no real PPA where you get that old version from unless any user manually creates it and rebuilds that old version there themselves.