Hi again,
Installation log must be somewhere inside $ORACLE_BASE/oraInventory directory.
Be sure you are oracle software owner user. Check it with whoami.
You are saying i can connect sqlplus without error so what is your problem pls explain more. post your /home/oracle/.bashrc file content. Post your tnsnames.ora (if you attempting to connect from client post its tnsnames) and listener.ora of the server.
Try
export ORACLE_SID=<yourdbname>
lsnrctl start
and then
post your lsnrctl status output
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