Hello, The accountsservice service hasn't access to dbus' interfaces throwing an error when they're needed.The problem, at least, appears with LightDM. The error looks like: WARNING: Error updating user /org/freedesktop/Accounts/User1000: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: No such interface "org.freedesktop.DisplayManager.AccountsService" For information, it already occured[0] and was resolved[1][2] in NixOS. After testing, simply wrapping the accountsservice package with relevant XDG_DATA_DIRS directories as done in the attached patch resolves the issue. However, there might be a proper solution I'm not aware of. Also the patch used in [2] doesn't seem to be needed in Guix. Have a nice day, L p R n d n [0]: https://github.com/NixOS/nixpkgs/issues/45059 [1]: https://github.com/NixOS/nixpkgs/pull/45107 [2]: https://github.com/NixOS/nixpkgs/pull/72400