This happens after running guix pull followed by guix system reconfigure. Downloading the file and attempting bunzip fails on many systems so network error seems unlikely. I'm very new to guix so I hope there's no important information missing. 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