Debian系统下修改登录画面的背景图

lightdm

配置路径

$ cat /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_debian.conf 
# Debian specific defaults
#

[greeter]
background=/usr/share/images/desktop-base/login-background.svg
theme-name=Adwaita
xft-antialias=true
xft-hintstyle=hintfull
xft-rgba=rgb
$ ll /usr/share/images/desktop-base/login-background.svg
lrwxrwxrwx 1 root root 42 4月   6  2020 /usr/share/images/desktop-base/login-background.svg -> /etc/alternatives/desktop-login-background
$ ll /etc/alternatives/desktop-login-background
lrwxrwxrwx 1 root root 33 4月  14  2020 /etc/alternatives/desktop-login-background -> /usr/share/desktop-base/china.svg

sddm

配置路径

$ ll /usr/share/sddm/themes/debian-theme
lrwxrwxrwx 1 root root 35 10月 30 23:07 /usr/share/sddm/themes/debian-theme -> /etc/alternatives/sddm-debian-theme
$ ll /etc/alternatives/sddm-debian-theme
lrwxrwxrwx 1 root root 36 10月 30 23:07 /etc/alternatives/sddm-debian-theme -> /usr/share/sddm/themes/debian-elarun
$ ll /usr/share/sddm/themes/debian-elarun
总用量 120
-rw-r--r-- 1 root root   196 7月  18  2018 angle-down.png
-rw-r--r-- 1 root root 89769 7月  18  2018 elarun.jpg
drwxr-xr-x 2 root root  4096 10月 30 23:06 images
-rw-r--r-- 1 root root  9474 7月  18  2018 Main.qml
-rw-r--r-- 1 root root  1314 7月  22  2018 metadata.desktop
-rw-r--r-- 1 root root   369 7月  22  2018 README
-rw-r--r-- 1 root root    79 7月  22  2018 theme.conf
$ cat /usr/share/sddm/themes/debian-elarun/theme.conf 
[General]
background=/usr/share/desktop-base/active-theme/login/background.svg