xavalillo@ubuntu:~/Escritorio/SecondLife-i686-3.3.0.251182$ ./secondlife
64-bit Linux detected.
Running from /home/xavalillo/Escritorio/SecondLife-i686-3.3.0.251182
 - Installing menu entries in /home/xavalillo/.local/share/applications
bin/do-not-directly-run-secondlife-bin: error while loading shared libraries: libgobject-2.0.so.0: cannot open shared object file: No such file or directory
*** Bad shutdown. ***

You are running the Second Life Viewer on a x86_64 platform.  The
most common problems when launching the Viewer (particularly
'bin/do-not-directly-run-secondlife-bin: not found' and 'error while
loading shared libraries') may be solved by installing your Linux
distribution's 32-bit compatibility packages.
For example, on Ubuntu and other Debian-based Linuxes you might run:
$ sudo apt-get install ia32-libs ia32-libs-gtk ia32-libs-kde ia32-libs-sdl

*******************************************************
This is a BETA release of the Second Life linux client.
Thank you for testing!
Please see README-linux.txt before reporting problems.