Just asked holger: the osmo-stp build from cellmgr in the nightly debian packages can be switched off. Since you've been fixing debian these days, could you do that one as well? Hopefully we will have no more failures then.
(...except on the new ubuntu 17.04 of course, no idea what's up with that. Not sure who added it and who will resolve those, or whether that's already done?)
Thanks!
~N