2859094 - upgrade error: Oracle Net Service configuration failed. The exit code is 1

During oracle upgrade you hit error as shown in the screenshot:


Or in the trace file you see following error:

[main] [ 2019-11-08 09:41:09.073 IST ] [HAUtils.getConfiguredGridHome:1343] ----- Getting CRS HOME ----
[main] [ 2019-11-08 09:41:09.073 IST ] [UnixSystem.getCRSHome:2967] olrFileName = /var/opt/oracle/olr.loc
[main] [ 2019-11-08 09:41:09.074 IST ] [HAUtils.getHASHome:1500] Failed to get HAS home.
PRCI-1144 : Failed to retrieve Oracle Grid Infrastructure home path
PRKC-1144 : File "/var/opt/oracle/olr.loc" not found.
[main] [ 2019-11-08 09:41:09.074 IST ] [ConfigureListener.isHASConfigured:1607] Is Oracle Restart configured: false
[main] [ 2019-11-08 09:41:09.074 IST ] [ConfigureListener.isHASRunning:1636] Is Oracle Restart running: false
[main] [ 2019-11-08 09:41:09.079 IST ] [ConfigureListener.listenerExists:396] Is listener "LISTENER" already exists: true
[main] [ 2019-11-08 09:41:09.079 IST ] [SilentConfigure.silentConfigureListener:410] Start listeners LISTENER
[main] [ 2019-11-08 09:41:09.081 IST ] [SilentConfigure.silentConfigureListener:416] Following Listeners were configured :
[main] [ 2019-11-08 09:41:09.081 IST ] [SilentConfigure.silentConfigureListener:417] Following Listeners will be started, if they are found in configured list : LISTENER
[main] [ 2019-11-08 09:41:09.082 IST ] [NetCAResponseFile.getNamingMethods:318] Naming methods from response file: TNSNAMES, ONAMES, HOSTNAME
[main] [ 2019-11-08 09:41:09.082 IST ] [SilentConfigure.performSilentConfigure:233] Custom profile configuration.
[main] [ 2019-11-08 09:41:09.082 IST ] [NetCAResponseFile.getNamingMethods:318] Naming methods from response file: TNSNAMES, ONAMES, HOSTNAME
[main] [ 2019-11-08 09:41:09.082 IST ] [NetCAResponseFile.getNSNNumbers:347] NSN Numbers from response file: 0

The system is not RAC or GRID.

Target Oracle <=12.1

PRCI-1144, /var/opt/oracle/olr.loc , KBA , BC-DB-ORA , Oracle , Problem