DPKG was interrupted

[Husse]

requires superuser privilege

That is the magic sudo command. So put sudo in front of the command and it'll work.
If the problem isn't solved post back

[Husse]

If you installed and had a power failure you could get really funny results
I have a solution here that may work.

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This occurs when the *.bin files in

/var/cache/apt/

become corrupted. Why they become corrupted seems to be a mystery ...
The solution is to delete all  *.bin files in that directory (which requires using sudo). After doing that, both Synaptic and apt-get should work fine. 

Delete sudo rm path_to_file/file
Be careful with what you do.
After doing that run

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dpkg --configure -a

again to be sure.