if you do a solaris 10u11 core/minimal installation and after that add all packages listed in the documentation the oracle database 18.104.22.168 software installation will fail with:
WARNING: Verification of target environment returned with errors. WARNING: [WARNING] [INS-13001] Environment does not meet minimum requirements. CAUSE: Minimum requirements were not met for this environment ACTION: Either check the logs for more information or check the supported configurations for this product.. Refer associated stacktrace #oracle.install.commons.util.exception.DefaultErrorAdvisor:339 INFO: Advice is CONTINUE WARNING: Advised to ignore target environment verification errors. INFO: Verifying setup for installer validations INFO: Overall status of CVU API call:OPERATION_FAILED SEVERE: [FATAL] [INS-30131] Initial setup required for the execution of installer validations failed. CAUSE: Failed to access the temporary location. ACTION: Ensure that the current user has required permissions to access the temporary location.
this is a bit misleading. the real cause of this (at least in my case) are missing packages:
once these are installed the installation will succeed.