Oracle on Debian Lenny: ORA-01034: ORACLE not available

Today I installed (again) Oracle XE on Debian (Lenny) and got the following error:

ORA-01034: ORACLE not available
ORA-27123: unable to attach to shared memory segment
SVR4 Error: 13: Permission denied

I suspected problem was caused by errant ORACLE_HOME / ORACLE_SID values bug got the answer:

chmod 6751 $ORACLE_HOME/bin/oracle

That gives "-rwsr-s--x". Why permissions were not set properly on installation – have no idea. Any clues?

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