Leo Famulari writes: > On Wed, Dec 05, 2018 at 10:05:57PM +0000, Christopher Baines wrote: >> >> substituting /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4... >> downloading from https://mirror.hydra.gnu.org/guix/nar/gzip/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4... >> ruby-sass-spec-3.5.4 1.3MiB 1.2MiB/s 00:01 [##################] 100.0% >> >> sha256 hash mismatch for /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4: >> expected hash: 1kq3ndiv72krwb5h8bissdarm9lbbl7zbfbnzyfwnncsjh6p5xcr >> actual hash: 0x0rzrvjm7q6x20bk5k2hc13zhp12njfga3b3azky4p2yxv60hcy >> substitution of /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4 failed >> guix build: error: build failed: some substitutes for the outputs of derivation `/gnu/store/xizmf292d80dxgv35z2ik4zimrcfzrx5-ruby-sass-spec-3.5.4.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source > > Are you still having this issue? It seems to work for me now. I can't quite remember what computer I was using at the time, but yes, it does seem to work now for me. substitute: updating substitutes from 'https://mirror.hydra.gnu.org'... 100.0% 1.4 MB will be downloaded: /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4 substituting /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4... downloading from https://mirror.hydra.gnu.org/guix/nar/gzip/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4... ruby-sass-spec-3.5.4 1.3MiB 1.4MiB/s 00:01 [##################] 100.0% /gnu/store/mnvng3pdri5v8497j5a6nij53z3knlk1-ruby-sass-spec-3.5.4