diff --git a/config/desktop/focal/environments/cinnamon/debian/postinst b/config/desktop/focal/environments/cinnamon/debian/postinst
index dff86ae847..a047a66a83 100755
--- a/config/desktop/focal/environments/cinnamon/debian/postinst
+++ b/config/desktop/focal/environments/cinnamon/debian/postinst
@@ -1,6 +1,6 @@
 # overwrite stock lightdm greeter configuration
 if [ -d /etc/armbian/lightdm ]; then cp -R /etc/armbian/lightdm /etc/; fi
-if [ -f /etc/lightdm/slick-greeter.conf ]; then sed '/^armbian03-Dre0x-Minum-dark-blurred-3840x2160.jpg s/armbian_4k_guss_gray_resultado.jpg' /etc/lightdm/slick-greeter.conf; fi
+if [ -f /etc/lightdm/slick-greeter.conf ]; then sed -i 's/armbian03-Dre0x-Minum-dark-blurred-3840x2160.jpg/armbian_4k_gray_gauss_resultado.jpg/g' /etc/lightdm/slick-greeter.conf; fi
 
 # Disable Pulseaudio timer scheduling which does not work with sndhdmi driver
 if [ -f /etc/pulse/default.pa ]; then sed "s/load-module module-udev-detect$/& tsched=0/g" -i /etc/pulse/default.pa; fi