Solve the Error in invoking target all no orcl of makefile in Oracle DB 12c in Ubuntu 15.0

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Hello Everyone, In this tutorial, Let us Install Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is .\r
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Hello Everyone, In this tutorial, Let us Install Oracle Database 12c in Ubuntu 14.10 - 64bit(Step by Step Process) For Completed Description and Full Command.\r
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Hello Everyone, In this tutorial, Step by Step Process Let us Install Oracle Database 12c R1 Enterprise Edition on Ubuntu 14.10 – 64Bit Completely Install .