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Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  libsdl-ttf2.0-0 libunistring0:i386 python-numpy python-pygame deluge-gtk
  libsdl-mixer1.2 libgomp1:i386 liblapack3gf deluge-common libmikmod2
  libcroco3:i386 libgettextpo0:i386 libblas3gf libgfortran3 libsmpeg0
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  linux-generic
The following packages will be upgraded:
  linux-generic
1 upgraded, 0 newly installed, 0 to remove and 212 not upgraded.
1 not fully installed or removed.
Need to get 0 B/1,722 B of archives.
After this operation, 1,024 B of additional disk space will be used.
Do you want to continue [Y/n]? y
dpkg: dependency problems prevent configuration of linux-generic:
 linux-generic depends on linux-image-generic (= 3.2.0.37.45); however:
  Version of linux-image-generic on system is 3.2.0.40.48.
 linux-generic depends on linux-headers-generic (= 3.2.0.37.45); however:
  Version of linux-headers-generic on system is 3.2.0.40.48.
dpkg: error processing linux-generic (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                          Errors were encountered while processing:
 linux-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)
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Please, try with some of the methods mentioned in this post‌​. If you find a solution (or not), tell us! –  Lucio Apr 20 '13 at 18:24
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2 Answers

First you shold try this commands:

sudo apt-get update
sudo apt-get upgrade

End after sudo apt-get -f install.

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error while trying "sudo apt-get update" W: Failed to fetch ppa.launchpad.net/hydr0g3n/ppa/ubuntu/dists/precise/main/source/… 404 Not Found W: Failed to fetch ppa.launchpad.net/hydr0g3n/ppa/ubuntu/dists/precise/main/… 404 Not Found W: Failed to fetch ppa.launchpad.net/hydr0g3n/ppa/ubuntu/dists/precise/main/… 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. –  Mrigankar Shaw Apr 20 '13 at 18:44
    
Open your Terminal and type sudo nautilus /etc/apt/sources.list.d/. Delete all files that have in their names hydr0g3n. –  Radu Rădeanu Apr 20 '13 at 19:00
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This can happen when the repo mirror is out-of-sync. Change mirrors or wait a day and see if your mirror caught up.

If you want to change mirrors try the tutorials in the answers to these questions:

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