Today I experienced an error while installing Sitecore 9 using the Sitecore installation framework:
“Install-SitecoreConfiguration : Error CREATEing SolrCore ‘xp0_xdb’: Unable to create core [xp0_xdb] Caused by: null”
Setting the verbose logging option didn’t help and my tries to manually reproduce the issue didn’t work out as well; Or the core was successfully created or I got an error message that the core was already created.