It appears as though there were issues linking the Oracle software after the installation was completed. Look through...
the installation log, usually located in $ORACLE_BASE/oraInventory/logs. The log file will have a name similar to installActions
You can try manually relinking the binaries by navigating to $ORACLE_HOME/bin (as the oracle software owner) and typing the following:
This will perform the same relink that the Oracle Universal Installer attempted during the initial installation.
With respect to the second portion of your problem where you say you "can't start Oracle," did you create a database? Did it create successfully? Have you reviewed the alert log for errors or problems? You cannot really start Oracle per se … you must create a database which can then be stopped and started.
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