DISPLAY not set.Set DISPLAY environment variable, then re-run.

Cause:

Display variable is not set and so dbca cannot be invoked

[oracle@dgprim01 bin]$ ./dbca
DISPLAY not set.
Set DISPLAY environment variable, then re-run.
[oracle@dgprim01 bin]$ export DISPLAY=localhost:10.0

Workaround:

Set DISPLAY variable

[oracle@dgprim01 bin]$ export DISPLAY=localhost:10.0
[oracle@dgprim01 bin]$ ./dbca

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