If you install Oracle on Ubuntu and you get the following error during listener startup:

Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
TNS-12555: TNS:permission denied
 TNS-12560: TNS:protocol adapter error
 TNS-00525: Insufficient privilege for operation
 Linux Error: 1: Operation not permitted

 

Change EXTPROC_FOR_XE in listener.ora to EXTPROC1 as shown below:

#(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
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