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$ sudo apt-get remove linux-image-extra-3.5.0-030500rc6-generic

Reading package lists... Done

Building dependency tree      

Reading state information... Done

You might want to run 'apt-get -f install' to correct these:

The following packages have unmet dependencies:

 crda : Breaks: wireless-crda (< 1.15) but 1.14 is to be installed

E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).