Hello, carl hansen! I had alike thing, and Ludovic Cortes answered here http://lists.gnu.org/archive/html/bug-guix/2018-09/msg00151.html Trying to boot with another kernel, as I think, guix used other workable derivation and I could to update with `guix pull` there.
> I installed guix 0.15 on Debian testing system > Power went out while 'guix pull'ing or something. > Now, show stopper error. Attached. How to proceed?