Same problem is:
Computing Guix derivation for 'x86_64-linux'... |ice-9/read.scm:126:4: In
procedure read-string: gnu/packages/virtualization.scm:643:1: invalid
character in escape sequence: #\return
guix pull: error: You found a bug: the program
'/gnu/store/kms78b5wzmp763lljsazbp8v8a88p1z8-compute-guix-derivation'
failed to compute the derivation for Guix ...

on "guix pull".

All my config are right there:
https://git.sr.ht/~shegeley/config/tree/master/item/home/core.scm

пн, 17 янв. 2022 г. в 22:31, Maxime Devos <maximedevos@telenet.be>:

> Grigory Shepelev schreef op ma 17-01-2022 om 22:02 [+0300]:
> > Encountered same problem again on both machines (recently installed
> > guix on laptop and an old desktop PC of mine).
>
> See <https://debbugs.gnu.org/server-control.html> for how to re-open.
>
> What is the ‘same problem’ here?  IIRC, there were two separate
> problems.
>
> Do you mean this one:
>
>   Unknown command: nix fish: nix show-derivation "~/.fr-sqOEpp/....
>   module-import-compiled.drv"
>
> > Seems like the problems arise after home reconfiguration. Still can
> > pull successfully from the root user.
>
> I didn't know you were using "guix home", was this also the case in the
> original report?  This seems potentially relevant information.  The
> exact contents of the home configuration (with personal information
> removed and preferably reduced to a minimal test case) could be useful
> to investigate the issue.
>
> Or was ‘same problem’ the following
> <https://issues.guix.gnu.org/52559#15>?
>
> Greetings,
> Maxime.
>