When I deinstall OBIEE and remove all files from <Middleware Home> then try to reintall the install still sees an "instance1".
I also drop the RCU in the Database. There must be another file on the Linux server that stores the instance1 config. For example a file located in the /var dir etc may have an Oracle file with "instance1" defined in it that the deinstall does not clean up.
What file outside of <MiddleWare Home> stores the "instance1" config setting?