Can't launch Nautilus

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http://askubuntu.com – I'm unable to launch Nautilus. If I launch it from a Terminal, it says: nautilus: error while loading shared libraries: libunity-protocol-private.so.0: cannot open shared object file: No such file or directory When I LD_PRELOAD this lib, this does work, but I want the solution to be permanent. Does someone has a clue to that ? Thanks. (HowTos)