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I have Debian 8.2 installed on a VirtualBox VM and I added the unstable (sid) repository to /etc/apt/sources.list without removing any other repositories and afterwards I ran apt-get update && apt-get upgrade && apt-get autoremove. Before this, I had Plasma 4 installed, I was hoping that adding this repository would give me Plasma 5, but instead I have no Plasma desktop installed at all, or so it seems. Whenever I run:

apt-get install kde-full

I get the error:

The following packages have unmet dependencies:
 kde-full : Depends: kde-plasma-desktop (>= 5:84) but it is not going to be installed
            Depends: kde-plasma-netbook (>= 5:84) but it is not going to be installed
            Depends: kdeartwork (>= 4:4.11.3) but it is not going to be installed
            Depends: kdenetwork (>= 4:4.11.3) but it is not going to be installed
            Depends: kdeutils (>= 4:4.11.3) but it is not going to be installed
            Depends: kdepim (>= 4:4.11.3) but it is not going to be installed
            Depends: kdeplasma-addons (>= 4:4.11.3) but it is not going to be installed
            Recommends: kde-standard (>= 5:84) but it is not going to be installed
            Recommends: kdewebdev (>= 4:4.11.3) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

whenever I try to install specific Plasma components using apt-get install like by running apt-get install kde-plasma-desktop I get similar errors, with the exact same final line (i.e., E: Unable to correct problems, you have held broken packages.).

Troubleshooting

As far as troubleshooting goes, I have Googled E: Unable to correct problems, you have held broken packages. and found the questions "Fix held broken packages on debian?" and "E: Unable to correct problems, you have held broken packages" and tried:

apt-get install -f kde-full

which returned the same error as running without the -f option. I also ran apt-get -f install and it just returned:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I have also tried running:

aptitude why-not kde-full

and

aptitude why-not kde-plasma-desktop

and both returned:

Unable to find a reason to remove ...

where ... is the package name provided after aptitude why-not. While apt-mark showhold returned no output whatsoever.

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