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I know how to check if a package is installed and if its available for install but I cannot find any list of packages that are installed with a release from Ubuntu.

Sometimes I am trying to answer something and I cannot remember if the tool I will refer was installed by default of if I installed in a later point and cant remember. What if its something I have and a user using another desktop environment does not?

I know I can recommend to install the package prior to asking him to use it but I would like to know if its installed by default or not.

Is there such list? Where can I find it?

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2 Answers

up vote 6 down vote accepted

Yes you can.

With each release, there is something called a "manifest" of the ISO created - this lists all the installed packages, their versions, etc.

Examples:

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Toppy! You made my day ;) –  Bruno Pereira Feb 17 '12 at 16:19
    
@BrunoPereira a pleasure. :) –  jrg Feb 17 '12 at 16:19
    
11.10 amd 64 = 1392 pkgs –  One Zero Feb 19 '12 at 11:10
    
Strictly speaking this is not the correct answer. The .manifest file lists the packages on the live CD/DVD or USB stick which is not necessarily what's in a default install. The .manifest file for 13.04 lists gksu and gparted both of these are on the install media; neither is exists in a clean install. I don't have a better answer though. –  Warren Hill May 12 '13 at 16:18
    
Ok, yes, that is correct. it isn't entirely accurate, but it's pretty close. –  jrg May 13 '13 at 1:11
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Indirectly you could check Synaptic history of installation (In the File menu) type the name of your package you will know when it was installed or updated.

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I don't want to do it in a system since when I am trying to tell someone "use this or that" I cannot have access to synaptic or my system all the time and I for sure don't have access to his system. Thanks for the answer anyways, +1. –  Bruno Pereira Feb 17 '12 at 16:09
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