David Philipe Gil via Bug reports for GNU Guix <bug-guix@gnu.org>
writes:

> I uninstalled glibc-locales and tried to reinstall and now I cannot
> reinstall it.

So you reinstalled Guix?

> guile: warning: failed to install locale
> The following package will be installed:
>    glibc-locales 2.31
>
> substitute: guix substitute: warning: ACL for archive imports seems to
> be uninitialized, substitutes may be unavailable

Did you intentionally disable binary substitutes?

> The following derivations will be built:
>    /gnu/store/rymq0i0my05d99ak07gkynj1k833fykp-glibc-locales-2.31.drv
>   
> /gnu/store/yqb4xxxjgwm21gnl0kp4w7awiamqjhi6-linux-libre-headers-5.4.20.drv
>    /gnu/store/kkk0l92v144xj04kzrccbggr5m7v8ppd-rsync-3.1.3.drv
>    /gnu/store/67dlbyg441iafjiz1k5xrrsp9iflidkr-popt-1.16.drv
>    /gnu/store/cgzl9aa8qr8bgzq7qr4m2bbb76c8azkl-popt-1.16.tar.gz.drv
> building /gnu/store/cgzl9aa8qr8bgzq7qr4m2bbb76c8azkl-popt-1.16.tar.gz.drv...
> downloading from http://rpm5.org/files/popt/popt-1.16.tar.gz ...
> \sha256 hash mismatch for
> /gnu/store/smgir46ibcnj6sr55lipl45xbafx89i9-popt-1.16.tar.gz:
>   expected hash: 1j2c61nn2n351nhj4d25mnf3vpiddcykq005w2h6kw79dwlysa77
>   actual hash:   0w0az9ni0gsh8zqpv3g15k2mrn201np876ha4442pfks9jpg0vyl
> hash mismatch for store item
> '/gnu/store/smgir46ibcnj6sr55lipl45xbafx89i9-popt-1.16.tar.gz'

Uff, this is because the domain that used to serve the tarball has
started serving very different content.  :-/

I have fixed this in the Guix master branch with commit
91c8b23e571b90e2d263194c9fbb2b05c0475dc1.