Hi Community

I'm a new user of concrete5, I've installed it onto an Ubuntu 16.04 server for evaluation as a CMS for our school but I'm having some SQL issues.
Can anyone help me?
When I try to add a new blog I get the following....

An exception occurred while executing 'SELECT date_format(cv.cvDatePublic, "%Y") as navYear, date_format(cv.cvDatePublic, "%m") as navMonth FROM Pages p LEFT JOIN PagePaths pp ON (p.cID = pp.cID and pp.ppIsCanonical = true) LEFT JOIN PageSearchIndex psi ON p.cID = psi.cID LEFT JOIN PageTypes pt ON p.ptID = pt.ptID INNER JOIN Collections c ON p.cID = c.cID INNER JOIN CollectionVersions cv ON p.cID = cv.cID LEFT JOIN CollectionSearchIndexAttributes csi ON c.cID = csi.cID WHERE (pt.ptID = ?) AND (p.cParentID = ?) AND (p.cPointerID < 1) AND (p.cIsTemplate = 0) AND (cvIsApproved = 1) AND (p.cIsActive = ?) AND (p.cIsSystemPage = ?) GROUP BY navYear, navMonth ORDER BY cvDatePublic desc' with params [7, 159, true, false]: SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'intranet.cv.cvDatePublic' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by