Install SQL*Plus on Ubuntu 16.04

First of all you need to download Instant Client Downloads. Install alien software so you can install rpm packages by typing following command in terminal.

sudo apt-get install alien

Once that is done, go to the folder where the rpm files are located and execute the following:

sudo alien -i oracle-instantclient*-basic*.rpm
sudo alien -i oracle-instantclient*-sqlplus*.rpm
sudo alien -i oracle-instantclient*-devel*.rpm

You need to install libaio.so. Type following command to do it:

sudo apt-get install libaio1

Create Oracle configuration file:

sudo vi /etc/ld.so.conf.d/oracle.conf

Put this line in that file:

/usr/lib/oracle/<your version>/client/lib/

Note - for 64-bit installations, the path will be:

/usr/lib/oracle/<your version>/client64/lib/

Update the configuration by running following command:

sudo ldconfig

Try to connect using:

sqlplus username/password@//dbhost:1521/SID

or:

sqlplus testuser/password

Note that if you installed the 64-bit version, the client is called sqlplus64.

Source: http://askubuntu.com/questions/159939/how-to-install-sqlplus