http://hydra.gnu.org/nar/fnd9k8rfz5jbvj80zjqh6l95imckqp51-linux-libre-4.2.6 596KiB/s 00:26 | 14.9MiB transferred
bzip2: Compressed file ends unexpectedly;
perhaps it is corrupted? *Possible* reason follows.
bzip2: Inappropriate ioctl for device
Input file = (stdin), output file = (stdout)
It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.
You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.
guix substitute: error: corrupt input while restoring '/gnu/store/fnd9k8rfz5jbvj80zjqh6l95imckqp51-linux-libre-4.2.6/lib/modules/4.2.6-gnu/kernel/drivers/isdn/gigaset/gigaset.ko' from #{read pipe}#
killing process 2102
guix system: error: build failed: some substitutes for the outputs of derivation `/gnu/store/fzn428v4c9iqkk97mz9r0c0bj89cfh2n-linux-libre-4.2.6.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source