Re: [PLUG] First attempt at creating a customized Live CD

[Scott Budihas <budihas@gmail.com>]

Eric,
You are correct about the signing key. To find the one you want let's 
use LibreOffice as an example...

Go to the PPA's site on Launchpad
https://launchpad.net/~libreoffice/+archive/ppa

Then click the link "Technical details about this PPA"

There you will see the signing key.


Note:

If you are in a fully chrooted LiveCD environment you can use the 
following to add the PPA and the key as well. Then apt-get update, etc.

add-apt-repository ppa:libreoffice/ppa

The details of this command (the name of the PPA not the syntax) are on 
the Launchpad site as well. add-apt-repository is not in the server 
version of Lucid. You have to install it.


Scott


On 06/06/2011 09:08 AM, Eric H. Johnson wrote:
> Hi all,
>
> I have been trying to follow the instructions here for creating a custom
> Live CD:
> https://help.ubuntu.com/community/LiveCDCustomizationFromScratch
>
> In the Make the ChRoot Environment
> (https://help.ubuntu.com/community/LiveCDCustomizationFromScratch#Make the
> ChRoot Environment) it says:
>
> <quote>
> You may edit the sources.list in the chroot to add a line from a PPA, if you
> need. You will need to add the PPA's key to your chroot's package manager.
> On the PPA's overview page you'll see the PPA's OpenPGP key id. It'll look
> something like this: 1024/12345678. Copy it, or make a note of, the portion
> after the slash, e.g: 12345678. This key will be added once we enter the
> chroot.
>
> Important: Make a backup copy of /sbin/initctl this next step will delete
> this file. There is a problem with 10.04 upstart package not containing
> /sbin/initctl.distrib and even after you update upstart the directions for
> leaving the chroot do not seem to restore this file.
>
> sudo chroot chroot
>
> mount none -t proc /proc
> mount none -t sysfs /sys
> mount none -t devpts /dev/pts
> export HOME=/root
> export LC_ALL=C
> sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 12345678
> #Substitute "12345678" with the PPA's OpenPGP ID.
> </quote>
>
> My question is about the last line where it says " Substitute "12345678"
> with the PPA's OpenPGP ID." It seems to say that with the assumption that
> you actually know what a PPA OpenPGP ID is. I realize it has to do with
> signatures for repositories, but I do not have the slightest idea where to
> get it. I have added a couple repositories to sources.list, but they should
> have been included when I did the copy of sources.list into chroot/etc/apt.
>
> Can someone tell me what I need to fill in for the OpenPGP ID or where to
> get it.
>
> Thanks,
> Eric
>
>
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