I had the same problem after a fresh install on linux.
I had to do the following to get things to work:
[/opt/splunk/etc/myinstall] # cp splunkd.xml.cfg-default splunkd.xml
[/opt/splunk/bin] # ./genRootCa.sh -d /opt/splunk/etc/auth
[/opt/splunk/bin] # ./genWebCert.sh
[/opt/splunk/share/splunk/search_mrsparkle] # cp -r modules.new/* modules
Now I see the splunkd and splunkweb processes starting and can I login.
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