When running neon-useredition-20160602-1018-amd64.iso in a live session, the AppStream database was empty. When doing sudo apt update, I got this message at the end: ** (appstreamcli:2434): CRITICAL **: Error while moving old database out of the way. AppStream cache update failed Manually executing "sudo appstreamcli refresh-index" tells me "AppStream cache update is not necessary" Reproducible: Always
This no longer appears to be an issue in the latest Live ISO.