Ran into this problem myself. Was able to resolve it with the following.
Confirmed error and fix on 7.0.5
rpm -i splunk...rpm
cd /opt/splunk
chown -R splunkserviceacct ./
/opt/splunk/bin/splunk enable boot-start -user splunkserviceacct
I believe this to have been occurring when splunk attempts to configure the directory as a different user ( permissions problem ). Splunk installs with account splunk, we use a service account, changed ownership to proper user and ran again, it worked.
Hope this helps!
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