Exchange 2013 Cu6 fails to install

When I attempt to install CU6 on Exchange 2013 I get this error message and cannot continue, occurs after reboot as well and trying to re-run setup.  Any ideas how to fix?

Thanks,

Setup Error 2nd time 5 of 9 after restart

Error:
The following error was generated when "$error.Clear(); 
          $name = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxUniqueName;
          $dispname = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxDisplayName;
          $dismbx = get-mailbox -Filter {name -eq $name} -IgnoreDefaultScope -resultSize 1;
          if( $dismbx -ne $null)
          {
          $srvname = $dismbx.ServerName;
          if( $dismbx.Database -ne $null -and $RoleFqdnOrName -like "$srvname.*" )
          {
          Write-ExchangeSetupLog -info "Setup DiscoverySearchMailbox Permission.";
          $mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true };
          if( $mountedMdb -eq $null )
          {
          Write-ExchangeSetupLog -info "Mounting database before stamp DiscoverySearchMailbox Permission...";
          mount-database $dismbx.Database;
          }

          $mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true };
          if( $mountedMdb -ne $null )
          {
          $dmRoleGroupGuid = [Microsoft.Exchange.Data.Directory.Management.RoleGroup]::DiscoveryManagement_InitInfo.WellKnownGuid;
          $dmRoleGroup = Get-RoleGroup -Identity $dmRoleGroupGuid -DomainController $RoleDomainController -ErrorAction:SilentlyContinue;
          if( $dmRoleGroup -ne $null )
          {
            trap [Exception]
            {
              Add-MailboxPermission $dismbx -User $dmRoleGroup.Name -AccessRights FullAccess -DomainController $RoleDomainController -ErrorAction SilentlyContinue;
              continue;
            }
            
            Add-MailboxPermission $dismbx -User $dmRoleGroup.Identity -AccessRights FullAccess -DomainController $RoleDomainController -WarningAction SilentlyContinue;
          }
          }
          }
          }
        " was run: "Microsoft.Exchange.Data.Common.LocalizedException: Couldn't resolve the user or group "Domain.local/Microsoft Exchange Security Groups/Discovery Management." If the user or group is a foreign forest principal, you must have either a two-way trust or an outgoing trust. ---> System.SystemException: The trust relationship between the primary domain and the trusted domain failed.

   at System.Security.Principal.NTAccount.TranslateToSids(IdentityReferenceCollection sourceAccounts, Boolean& someFailed)
   at System.Security.Principal.NTAccount.Translate(IdentityReferenceCollection sourceAccounts, Type targetType, Boolean forceSuccess)
   at System.Security.Principal.NTAccount.Translate(Type targetType)
   at Microsoft.Exchange.Configuration.Tasks.SecurityPrincipalIdParameter.GetUserSidAsSAMAccount(SecurityPrincipalIdParameter user, TaskErrorLoggingDelegate logError, TaskVerboseLoggingDelegate logVerbose)
   --- End of inner exception stack trace ---
   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target, Boolean reThrow, String helpUrl)
   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)
   at Microsoft.Exchange.Configuration.Tasks.SecurityPrincipalIdParameter.GetUserSidAsSAMAccount(SecurityPrincipalIdParameter user, TaskErrorLoggingDelegate logError, TaskVerboseLoggingDelegate logVerbose)
   at Microsoft.Exchange.Configuration.Tasks.SecurityPrincipalIdParameter.GetSecurityPrincipal(IRecipientSession session, SecurityPrincipalIdParameter user, TaskErrorLoggingDelegate logError, TaskVerboseLoggingDelegate logVerbose)
   at Microsoft.Exchange.Management.RecipientTasks.SetMailboxPermissionTaskBase.InternalValidate()
   at Microsoft.Exchange.Management.RecipientTasks.AddMailboxPermission.InternalValidate()
   at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()
   at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".