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Asked: 2020-07-31 05:29:53 +0800 CST

Why does Ubuntu MATE use two different greeters?

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I'm running Ubuntu MATE 20.04 on one of my machines, and noticed that for some reason, it appears to be using two different greeters. It looks like LightDM for the login screen, but something else for the lock screen. How can I change it to be consistent? (And preferably use LightDM on the lock screen so that the power options are available)?

Login:

enter image description here

Lock:

enter image description here

login lock-screen lightdm mate

1 Answers

  1. The first greeter is LightDM with corresponding theme.
    The second is the screensaver locker powered by MATE ScreenSaver. You can replace it with LightDM based one. Below is how.

    Change MATE Screensaver to Light Locker

    To remove MATE Screensaver you have to execute the following commands:

    sudo apt-get purge mate-screensaver
sudo apt-get autoremove --purge

    To install LightDM based screenlocker install the corresponding package with:

    sudo apt-get install light-locker

    Set corresponding keyboard shortcut to lock the screen by Super+L with command below

    gsettings set org.mate.Marco.keybinding-commands command-1 "light-locker-command -l"

    And for Ctrl+Alt+L we need some kind of hack:

    cat <<EOF | sudo tee /usr/local/bin/xscreensaver-command
#!/bin/bash
light-locker-command -l
EOF
sudo chmod a+x /usr/local/bin/xscreensaver-command

    You can change settings of light-locker by using its settings - light-locker-settings.

    Change Light Locker back to MATE Screensaver

    To restore original system state install the corresponding package by

    sudo apt-get install mate-screensaver ubuntu-mate-desktop ubuntu-mate-core

    restore default setting with:

    gsettings set org.mate.Marco.keybinding-commands command-1 "mate-screensaver-command --lock"

    and remove light-locker with

    sudo apt-get purge light-locker
sudo rm /usr/local/bin/xscreensaver-command

    Note: I reported bug 1889632 to launchpad and upstream about future integration of mate-settings-daemon with light-locker.

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