I have a Pi2bv1.1 running Raspbian GNU/Linux 9 (stretch). I'd like to build the owncloud client (now at version 2.4.3), since a prebuilt one isn't available. When I follow ownCloud's instructions , it fails with; Can not find version '2.2.4+dfsg-2' of package 'owncloud-client' when executing Debian/...

I don't want to thread jack, but how did you deal with unlocking the keyring automatically? The Owncloud client won't launch until the keyring is unlocked, which is a bit of a problem for headless use.