For everybody who got this Error with Ubuntu 17.10:
./magnetd: error while loading shared libraries: libboost_system.so.1.58.0: cannot open shared object file: No such file or directory

If you follow the guide and you unrar the wallet it asked you if you want to overwrite. You must choose Never with E.
In the Wallet from Website there is a Folder with the old 16.04 Magnetd and it will overwrite the 17.10 magnetd.

After try this my magnetd worked and now i only Need to get the 10k magnet

Hope i could help anybody. It takes me three afternoons to find this stupid part out:)