How 2 login in 10g on ubuntu at sql prompt

conn system/umarERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
means did i install successfully? please tel me somebody?

This should help:
Installation on Ubuntu 10.04, Lucid Lynx
Note: this is what I have in my envOraXEclient (you can name it anything you want) under the oracle account of Ubuntu:
export ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server
export TNS_ADMIN=$ORACLE_HOME/network/admin
export TWO_TASK=XE
export LD_LIBRARY_PATH=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/lib
export PATH=$ORACLE_HOME/bin:${PATH}
R/ Zaf

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