In ver 2.2.5 of Magento CE, var/log/update.log contains errors similar to:
update-cron.ERROR: Cron readiness check failure! Found following non-writable paths: /unqualified-path/magento2/.github [] []
But there is no such directory as magento2/.github !
There are a number of .github directories elsewhere, but the error persists even if I change their permissions to 777.
Additional info: - shared server, I have no access to the account running Apache and cannot change ownership of the files to that account - When first installed, using composer, the readiness check passed with no problem - In general, both the frontend and the admin of Magento are working OK.