From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: Unable to use Aspell installed via Guix
Date: Sat, 6 May 2017 16:32:50 -0400
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To: Niall Dooley <dooleyn@gmail.com>
Cc: Alex Kost <alezost@gmail.com>, help-guix <Help-Guix@gnu.org>

On Sat, May 06, 2017 at 10:24:35PM +0200, Niall Dooley wrote:
> I tried to install the dict as you advise but it was unsuccessful. See below.
> My issue may be related to the other thread I raised about being unable to
> upgrade packages. Thanks for your input.

[...]

> guix substitute: error: download from
> 'https://mirror.hydra.gnu.org/guix/nar/gzip/0krzlail39f8lf58bnm0jwvrr0sb0f8s-aspell-dict-en-2016.11.20-0'
> failed: 404, "Not Found"
> guix package: error: build failed: some substitutes for the outputs of
> derivation `/gnu/store/0xq6hspp0xqvxnb7mqlj3phpf3m14k7g-aspell-dict-en-2016.11.20-0.drv'
> failed (usually happens due to networking issues); try `--fallback' to
> build derivation from source

Try adding the --fallback option to the command that failed.