Download client lib from here (Base + sqlplus + SDK). Unzip all in /opt/oracle
/etc/profile.d/oracle.sh
export ORACLE_HOME=/opt/oracle
export PATH=${PATH}:/opt/oracle
export LD_LIBRARY_PATH=/opt/oracle
/etc/ld.so.conf.d/oracle.conf
/opt/oracle
adjust library names
cd /opt/oracle ln -s libclntsh.so.1?.1 libclntsh.so ln -s libocci.so.1?.1 libocci.so
run sudo ldconfig
add to .bashrc
alias sqlplus="rlwrap sqlplus"
install libaio
apt install libaio1