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lenhan@lenhan-K55A:~$ sudo apt-get install synaptic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 synaptic : Depends: libept1.4.12 but it is not installable
            Recommends: rarian-compat but it is not installable
E: Unable to correct problems, you have held broken packages.
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marked as duplicate by Avinash Raj, karel, Warren Hill, Eric Carvalho, Mitch Mar 14 at 14:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Welcome to Ask Ubuntu! This question will probably be closed as a duplicate soon. If those answers don't fully address your question please edit it to include why and flag this for re-opening. Thanks! –  Danatela Mar 14 at 5:54

1 Answer 1

You should update your package list:

sudo apt-get update

If it doesn't help, use

sudo mv /var/lib/apt/lists /var/lib/apt/lists.old && sudo apt-get update

If it says,

Unable to correct problems, you have held broken packages

sudo apt-get -f install
sudo dpkg --configure -a
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hic!lenhan@lenhan-K55A:~$ sudoapt-get install synaptic sudoapt-get: command not found i've tried it!!+1 –  kimngan Mar 14 at 6:04
    
sudo is a separate command, apt-get too. Insert space bar between them. –  Danatela Mar 14 at 6:06
    
It says that: ....... Unable to correct problems, you have held broken packages. I've tried it! –  kimngan Mar 14 at 6:11
    
I've updated answer, check it. –  Danatela Mar 14 at 6:14
    
it says that: lenhan@lenhan-K55A:~$ sudo apt-get -f install sudo dpkg --configure -a E: Command line option --configure is not understood –  kimngan Mar 14 at 6:16

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