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I'm creating a LiveCD from this guide and came across a line I do not understand:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 12345678 
#Substitute "12345678" with the PPA's OpenPGP ID.

wondered if anyone can explain what should I substitue 12345678 with and how to obtain it

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1 Answer 1

The information is listed on the ppa page in launchpad

Sample screenshot :

enter image description here

So , using the above as an example

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A9E345C0

See PPA FAQ and Ubuntu wiki secure apt for details

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