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I tried installing tlp and Ubuntu tweak on my new Ubuntu(previously I had the same Ubuntu, but reinstalled it). When adding their sources, I got the error no ultimately trusted keys found.In the previous installation I did not get these errors.

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Its something about PPA problems , I mean its all about Broken PPA's. all you need to fix them.If you want to know more why it has happen : http://trog.qgl.org/

To fix the issue , open your terminal and type as

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install launchpad-getkeys

Then launch the application with sudo

sudo launchpad-getkeys

that will take care of your issue.

Credit Goes webupd8 & trog.qgl.org

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You also can use a program called YPPA manager, it can do it for you. sites.google.com/site/installationubuntu/tweaking-ubuntu/… –  belkinsa Sep 29 '13 at 14:33
    
"my@my-Pc:~$ sudo apt-get install gnome-panel Reading package lists... Done Building dependency tree Reading state information... Done Package gnome-panel is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source"THis comes up –  Hassan Sep 30 '13 at 1:58
    
yes its due to the PPA Problems. –  raaz Sep 30 '13 at 2:28
    
this is after I used the launchpad –  Hassan Sep 30 '13 at 16:32
1  
@Hassan disable the other PPA in your software sources for temporarily and update the cache again. –  raaz Sep 30 '13 at 16:38
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