APT happy again is easy:
1. Get the key. Either download the `repository key from here
- <_static/apsy.gse.uni-magdeburg.de.asc>`_
- or fetch it from *subkeys.pgp.net* (2649A5A9).
+ <_static/neuro.debian.net.asc>`_
+ or fetch it from http://wwwkeys.pgp.net (2649A5A9).
2. Now feed the key into APT by invoking::