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My ubuntu software centre is giving me an error of items cannot be installed or removed until the package catalogue is repaired and when I try to repair it it says package dependencies cannot be resolved with an error of

crossover-pro:i386: Depends: libz1 but it is a virtual package
                Depends: perl5-base but it is a virtual package

I tried the sudo below as well as

sudo dpkg --configure --pending and
sudo dpkg --configure -a 

but still not fixed, any help greatly appreciated

sudo apt-get update

Fetched 2,329 kB in 55s (41.9 kB/s)
Reading package lists... Done

sudo apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... failed.
The following packages have unmet dependencies.
 crossover-pro:i386 : Depends: perl5-base:i386
                  Depends: perl-modules:i386 but it is not installable
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies
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When you installed your ubuntu ? –  Muhammed Yüce Jan 17 '13 at 20:03
    
I've tried a few others but get this: james@James-PC:~$ sudo apt-get --purge --reinstall install software-center 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. crossover-pro:i386 : Depends: perl5-base:i386 Depends: perl-modules:i386 but it is not installable E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). james@James-PC:~$ –  jayc77 Jan 17 '13 at 20:06
    
By Muhammed Yüce posted as an answer: You never tried to delete and install again? When you installed your ubuntu ? –  gertvdijk Jan 17 '13 at 20:20
    
You can always edit your question and provide any needed info there. –  guntbert Jan 17 '13 at 20:32
    
Hi Muhammed, I never tried a re-install, trying to avoid that as have done that 4 times now for other problems, I will try booting into the repair mode to see if that will fix it. –  jayc77 Jan 18 '13 at 7:17
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