I'm using the response file to silently install oracle 11gR2 software on Linux. I also have 10g currently running on that server.
However, I ran into a problem indicating oracle software already installed in the given Oracle home for 11g. So I manually deleted that Oracle home and all subdirectories. Now, it still complains that I have already install the software in the directory, but that directory doesn't exists no more. I checked oratab and there isn't an entry there, except for the 10g entry.
I installed 11g software (ORACLE_HOME=/opt/oracle/11gR2) using the reponse file. Then I removed the ORACLE_HOME and all its subdirectories. Now when I run the ./RunInstaller using the silent method, it keeps saying that the oracle home already has the software installed and I must install it in a different oracle home. Somewhere, it is kept the old information .