Hi,
it's really a pain in the you-know-where to upgrade Bamboo server on a headless server in the cloud - everything must be done manually. To make it even more tedious, the latest version release bundle is provided through GUI only - the release archive does not contain direct link to the latest version. So, one has to use browser debugger in order to catch the link to the latest release to be able to wget it on the cloud server (it would take an hour to download it on the local machine and then upload it back to the cloud).
BR, Joni