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Good evening,

I'm trying to change some of the colours of my login screen in my Ubuntu 18.04. I followed some questions here on AskUbuntu, and edited my css files at /usr/share/gnome-shell/theme/gnome-shell.css (I'm using that configuration) - Specifically, I changed the values of .lockDialogGroup to a nicer dark gray.

My login screen is indeed now a nice dark gray instead of that hellish purple.

However, if I lock my computer without shutting down the machine, I still get a different purple gradient, which I haven't managed to change. I'm serching around but since I don't even know what to call this "behind-the-shield" screen, I can't find relevant results.

I suspect the login screen and the lock screen are two different managers altogether.

Here's a short mp4 video of me literally filming my screen, to make you understand which color I'm trying to change:

https://imgur.com/8aBWhd4

EDIT: There seems to be a discrepancy between my first-after-boot login screen, and my login-after-locking screen.

first Login screen after boot: enter image description here

After-lock login screen: enter image description here

  • @PRATAP Doesn't matter, I'm interested in finding where the .css that controls this gradient is located – Dimitris Sfounis Jan 6 '19 at 13:15
  • Which desktop environment are you using? The default gnome or something else? Please edit the output of printf 'Desktop: %s\nSession: %s\n' "$XDG_CURRENT_DESKTOP" "$GDMSESSION" into your post. as suggested here – Elder Geek Jan 14 '19 at 20:03
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Edit the file /usr/share/xsessions/ubuntu-communitheme-snap.desktop and change the "ubuntu-communitheme" text to "myct" (change anything, not necessarily "myct") in the line starting with Exec=

sudo -H gedit /usr/share/xsessions/ubuntu-communitheme-snap.desktop

enter image description here

[Desktop Entry]
Name=Ubuntu with communitheme snap
Comment=This session logs you into Ubuntu
Exec=env GNOME_SHELL_SESSION_MODE=myct /snap/communitheme/current/session
TryExec=/snap/communitheme/current/session
Type=Application
DesktopNames=communitheme:ubuntu:GNOME
X-Ubuntu-Gettext-Domain=gnome-session-3.0

create a file named myct.json in the directory /usr/share/gnome-shell/modes/ with below content.

enter image description here

{
    "parentMode": "user",
    "stylesheetName": "myct.css",
    "enabledExtensions": ["ubuntu-dock@ubuntu.com", "ubuntu-appindicators@ubuntu.com"]
}

Create a text file named myct.css in the directory /usr/share/gnome-shell/theme/

sudo touch /usr/share/gnome-shell/theme/myct.css

Open the file and paste the below content

sudo -H gedit /usr/share/gnome-shell/theme/myct.css

Content:

@import url("/snap/communitheme/current/share/gnome-shell/theme/Communitheme/gnome-shell.css");

#lockDialogGroup {
  background-color: magenta; }

Reboot and then lock the screen to see your preferred color.

enter image description here

enter image description here

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