sqlplus doesn't start on linux 64

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http://stackoverflow.com – I installed, on Mint15 64bit, the Oracle Instant client package 11 Each time I try running sqlplus I get message Error 6 initializing SQL*Plus SP2-0667: Message file sp1<lang>.msb not found SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory Of course I set correctly the $ORACLE_HOME. I tried to set LANG=us Same result. I tried with instant oracle 12.1, same results !? Except waving to MariaDb ;) What part is wrong in my install ? (HowTos)