Installing snaps denied by polkit on minimal system

[Chris West]

I installed gnome-software to attempt to install a snap. Installing a snap requires logging in to the snap store? The login dialog does not let me log in with my launchpad details, it shows:

https://quad.pe/e/fG5ZLaxMiL.png

GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._snapd_2derror_2dquark.Code9: Permission denied by Polkit

The log (attached) doesn't seem to have any other details. It doesn't seem to be trying to validate the credentials; anything will give the same error.

I don't have much Gnome stuff installed; I'm running i3wm without any gnome-session or anything running, but I haven't intentionally crippled or disabled any Gnome stuff either; it's only absent if it's absent.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-software 3.26.1-0ubuntu2.17.10.1
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
Date: Sat Dec 23 02:16:04 2017
InstalledPlugins:
 gnome-software-plugin-flatpak N/A
 gnome-software-plugin-limba N/A
 gnome-software-plugin-snap 3.26.1-0ubuntu2.17.10.1
SourcePackage: gnome-software
UpgradeStatus: Upgraded to artful on 2017-09-12 (101 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Salvolupo-g (salvolupo-g)]

A workaround is to install snap by command line as it doesn't require logging.
sudo snap install snap-name

[Sebastien Bacher (seb128)]

there is probably a depends/recommends missing for polkit prompt to work as they should

[Robert Ancell (robert-ancell)]

The recommends should probably be on the snapd package, as the client doesn't know that Polkit is in use / directly interact with it.