Hi, I'm puzzled over an error message I'm getting while trying to install a package with Guix, and wonder if I'm doing something radically wrong.

I'm using Guix on a foreign distro (Ubuntu 18.04), and am trying to install the "remmina" package. That package seems to be listed on the "packages" website (here), I've run guix pull to make sure listings are up to date, and the Guix git repo seems to contain instructions on how to build it here, but if I run the command guix install remmina --dry-run I get the message

guix install: error: remmina: unknown package 

(The package also doesn't show up if I run guix package --list-available='rem'.) Is there some obvious mistake I'm making here?

(In contrast, trying to install another VNC client, vinagre, seems to work fine: guix install vinagre results in Vinagre 3.22.0 being installed.)

Any advice welcome!