How do I create a popup banner before login with Lightdm?
The configuration file /etc/lightdm/lightdm.conf defines the available sessions. The sessions themselves are defined in /usr/share/xsessions. It should be not a problem to modify the default /usr/share/xsessions/ubuntu.desktop to wrap the gnome-session command around in a script that first displays the zenity dialog, and then either exits with a nonzero status or launches the gnome-session command.
Specifically:
Create a file called /usr/bin/mysess.sh which contains, for example, the following:
#!/bin/bash if /usr/bin/zenity --question --text="`cat /etc/issue`" --no-wrap ; then gnome-session --session=ubuntu ; else exit 1 ; fi
To edit this file, use
gksu gedit /usr/bin/mysess.sh
Also, make it executable
sudo chmod a+x /usr/bin/mysess.sh
Modify the file /usr/share/xsessions/ubuntu.desktop as follows:
[Desktop Entry] Name=Ubuntu Comment=This session logs you into Ubuntu Exec=/usr/bin/mysess.sh TryExec=unity Icon= Type=Application X-Ubuntu-Gettext-Domain=gnome-session-3.0
Now, if anyone tries to log on, the person has to click "Yes" in order to log in; otherwise, it will return to the login screen.
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Rich Loring
Updated on September 18, 2022Comments
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Rich Loring over 1 year
When Ubuntu was using gnome I was able to create a popup banner like the banner below before the login screen using zenity in the /etc/gdm/Init/Default. The line of code would be like this:
if [ -f "/usr/bin/zenity" ]; then /usr/bin/zenity --info --text="`cat /etc/issue`" --no-wrap; else xmessage -file /etc/issue -button ok -geometry 540X480; fi
How can I accomplish this with Unity?
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Admin almost 10 yearsThis doesn't work in Ubuntu 12.04 :(
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