How to change the current display manager background?

Support & Help Requests
1

I have Ubuntu MATE 17.10, , and woouldl ike to change the grub background.

I figured out how to make the config file which does change slick-greeter look. But despite I changed the path to the background I want to achieve, it’s a blank screen still, since it is set in the code which overwrited the background path. . Since I did put this file into action my drawbacks become that my user is not selected, first I have to type my username. So how to change that, and how to make work the background would be nice achievement. The code is here:

[Greeter]

LightDM GTK+ Configuration

autologin-user=‘milli’
activate-numlock=true
background=’/usr/share/backgrounds/gnome/icescape.jpg
background-color=’#000000’
draw-user-backgrounds=true
draw-grid=false
show-hostname=true
show-power=true
show-a11y=false
show-keyboard=true
show-clock=true
show-quit=true
logo=’’
other-monitors-logo=’’
theme-name=‘Ark-Dark’
icon-theme-name=‘EvoPop’
font-name=‘Clear Sans 10’
xft-antialias=true
xft-dpi=96
xft-hintstyle=‘hintslight’
xft-rgba=‘rgb’
onscreen-keyboard=false
high-contrast=false
screen-reader=false
play-ready-sound=’’
hidden-users=[]
group-filter=[]
enable-hidpi=‘auto’
[Greeter]

2

I just found my original post replaces slick-greeter which wasn’t intended. See the real solution from @Spyder below.

3

Slick greeter has it’s own configuration file - it has fewer user settings than lightdm-gtk greeter.

I have this on my Ubuntu MATE 17.10, at /etc/lightdm/slick-greeter.conf:

[Greeter]
background=/usr/share/backgrounds/ubuntu-mate-common/Grey-Wall-Logo.png
theme-name=Ambiant-MATE-Dark
icon-theme-name=Ambiant-MATE
draw-grid=false
hidden-users=libvirt-qemu

(Note: hidden-users is only there because I have KVM/QEMU virtual machines on this system. )

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