How to remove the desktop background image from the lock screen?

Question

linux

Hello!
It is necessary to remove the desktop background image from the lock screen, while changing the wallpaper on the desktop.
On Ubuntu in Gnome was able to disable background on splash screen with gnome-tweak-tool

Screenshot of the program (made from cinnamon)

but, because I don’t have Gnome, but Cinnamon in Linux Mint, then this procedure will not be performed here (surprisingly, the display mode setting works, i.e. “stretching” the image for the desktop)
Accordingly, I see a solution through two problems:
1. Is there an analog gnome-tweak-tool for Cinnamon?
2. How else can I disable the synchronization of the picture from the desktop and from the lock screen?

Answer 1

Gnome Tweak Tool is suitable for cinnamon as it is a separate branch from Gnome3.
In addition, you have the ability to edit themes manually. Go to /usr/share/themes or
~/.themes and then in the appropriate theme folder edit the gtk-3.0/gtk.css file.
Here is a solution from the LightDM wiki:
Changing the Wallpaper
LightDM does not configure the look of greeters; to do this configure the appropriate greeter.
Unity Greeter by default shows the currently selected users background. To set the default background and stop the switching edit /usr/share/glib-2.0/schemas/10_unity_greeter_background.gschema.override
[com.canonical.unity-greeter]
draw-user-backgrounds=false
background='/foo/wallpaper. png'
And run sudo glib-compile-schemas /usr/share/glib-2.0/schemas/ to apply these settings.
For LightDM GTK+ greeter edit /etc/lightdm/lightdm-gtk-greeter.conf:
background=/usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png