Lock the GNOME location services switch

Quoting from the "[Tails-dev] Lock the location services switch" email thread, credits to Astral Projection astralprojection2023@airmail.cc:

So a friend of mine was confused about a setting in tails. They were trying tails for the first time and were going through the settings and saw location services can be turned on and got worried.

I assured them that it doesn’t matter because that feature requires geoclue to work which is not included in tails.

Locking the switch to prevent this setting from being able to be turned on (even though it requires geoclue to work) would be a good idea to implement and easy to implement.

I tested this and it did work in both tails and on normal Gnome desktop.

Source: https://help.gnome.org/admin/system-admin-guide/stable/dconf-lockdown.html.en https://help.gnome.org/admin/system-admin-guide/stable/desktop-background.html.en

Requires setting value in local.d file to correspond to locks keyfile

Add this line to:

/etc/dconf/db/local.d/00_Tails_defaults

[org/gnome/system/location] enabled = false

Then create this directory

/etc/dconf/db/local.d/locks

Create file named something like 00_location-services-disable-switch in that directory

add this line to that file:

/org/gnome/system/location/enabled

Now go to Settings -> Privacy -> Location Services and you can see that switch is locked and setting can't be turned on in the slider