Splunk Enterprise: "Roles" menu is not visible in Settings Menu after upgrade to v.8

[mlevsh]

We just upgraded our SE low environment  to v. 8.0.6 and "Roles" sub-menu disappeared from Settings Menu on Search Heads (we have Search Head cluster)

We can get there directly by going to  https://<our_url>/en-US/manager/search/authorization/roles ,but not via Settings -> Roles. At the same time "Roles" sub-menu is available for navigation on other servers in the same environment, also upgraded to v. 8.0.6

Any ideas would be appreciated

[mlevsh · Accepted solution]

Solution:
Per Splunk Support recommendation:
"Please move this file out of Splunk and restart:
$SPLUNK_HOME/etc/apps/search/local/data/ui/manager/authentication_roles.xml
This file seems to be left over from the upgrade, it is a known issue from other versions."