ubuntu-mate.md

Mate Desktop:

sudo apt-add-repository ppa:ubuntu-mate-dev/ppa
sudo apt-add-repository ppa:ubuntu-mate-dev/trusty-mate
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install --no-install-recommends ubuntu-mate-core ubuntu-mate-desktop

Light DM Greeter

sudo dpkg-reconfigure lightdm
sudo apt-get install lightdm-gtk-greeter

sudo vim /etc/lightdm/lightdm.conf

[SeatDefaults]
greeter-session=lightdm-gtk-greeter
allow-guest=false

Greeter Background

Edit in /etc/lightdm/lightdm-gtk-greeter.conf

Keyboard Layout

The problem was that I forgot the file /etc/X11/xorg.conf.d/20-keyboard.conf . I created it with the content:

Section "InputClass"
    Identifier "keyboard"
    MatchIsKeyboard "yes"
    Option "XkbLayout" "de"
    Option "XkbVariant" "nodeadkeys"
EndSection

Theme

[Desktop Entry]
Name=AdjustedTheme
Type=X-GNOME-Metatheme
Comment=

[X-GNOME-Metatheme]
GtkTheme=Radiant-MATE
MetacityTheme=Ambiant-MATE
IconTheme=Radiant-MATE
GtkColorScheme=base_color:#ffffff,fg_color:#4c4c4c,tooltip_fg_color:#ffffff,selected_bg_color:#87A752,selected_fg_color:#FFFFFF,text_color:#3C3C3C,bg_color:#f6f4f2,tooltip_bg_color:#000000,link_color:#A7BB85
CursorTheme=DMZ-White
CursorSize=24
NotificationTheme=standard