Ubuntu 18 was released in 2019 whereas 6.4 was released in 2018. There might be some new security fixes in Ubuntu 18 that does not work properly with 6.4You can wait a few months for 6.5 release and test that with ubuntu 18

Looking at the error, Setting up a DEBUG logger on the following classes will provide more info:org.apache.jackrabbit.oak.plugins.indexorg.apache.jackrabbit.oak.query

Can you try to rebuild the clientlibs?http://<host>:<port>/libs/granite/ui/content/dumplibs.rebuild.html Also, do you see any error in the error.log ?

- Try to clear one or two items from the queue.- Check permissions for "replication-service" and "replication-receiver" on both author and publisher and compare it with a working setup.- Try to restart "com.day.cq.cq-replication" bundle- Setup a DEBUG logger on com.day.cq.replication and it will pro...

This is definitely related to read/write permissions on the mentioned path. Can try setting up with a different folder or run the process with a user having sudo access.

You can check BaseAction ("The Adobe AEM Quickstart and Web Application.") .Base action class uses a handles() function to check the following parameters:-     * @param source The Resource to roll-out.     * @param target The Resource to receive the modification.     * @param relation LiveRelationsh...

For AEM 6.3, Impersonating and unlocking a page is not allowed and can be treated as a product limitation.