I think this is caused by the outage of the opensuse download infrastructure mentioned in this post: https://central.owncloud.org/t/client-install-on-linux-mint-17-03-based-on-ubuntu-14-04/9321/2
I think this is caused by the outage of the opensuse download infrastructure mentioned in this post: https://central.owncloud.org/t/client-install-on-linux-mint-17-03-based-on-ubuntu-14-04/9321/2