Hello, I've downloaded from oracle.com this software to connect with a
Oracle server from my university:
   
    (Instant Client Downloads for Linux x86)

    Instant Client Package - Basic: All files required to run OCI, OCCI,
and JDBC-OCI applications

    *Instant Client Package - SQL*Plus: Additional libraries and executable
for running SQL*Plus with Instant Client

I've followed the Installation Steps:

    1. Download the appropriate Instant Client packages for your platform.
All installations REQUIRE the Basic package.

    2. Unzip the packages into a single directory such as "instantclient".

    3. Set the library loading path in your environment to the directory in
Step 2 ("instantclient"). On many UNIX platforms, LD_LIBRARY_PATH is the
appropriate environment variable. On Windows, PATH should be used.

    4. Start your application and enjoy.

But when I run sqlplus I get:

    sqlplus: error while loading shared libraries: libsqlplus.so: cannot
open shared object file: No such file or directory

I tried to define LD_LIBRARY_PATH with the directory, I also add that
directory to PATH, but I've got the same error. I'm using Ubuntu Linux.
Any idea?

Thank you very much.