<code>
sudo apt install lightdm
sudo nano /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf 
sudo reboot
sudo mkdir /etc/skel/.config/
sudo cp /home/admininfo/.config/gnome-initial-setup-done /etc/skel/.config/
sudo ln -s /home/invite /etc/guest-session/skel
sudo nano /etc/guest-session/skel/.profile

sudo nano /etc/lightdm/lightdm.conf.d/50-show-manual-login.conf
sudo nano /var/lib/AccountsService/users/invite 
sudo reboot


sudo nano /etc/guest-session/prepare.sh    
sudo nano /etc/guest-session/choose-language-wrapper.sh    
sudo chmod +x /etc/guest-session/choose-language-wrapper.sh   
sudo nano /etc/guest-session/choose-language-wrapper.sh    
sudo nano /usr/share/lightdm/guest-session/skel/.config/autostart/guest-session-startup.desktop    
sudo nano /usr/lib/lightdm/guest-session-auto.sh    
sudo apt update && sudo apt upgrade -y && sudo apt dist-upgrade -y && sudo apt autoremove && sudo apt clean && sudo df -h


sudo ls -la /usr/share/lightdm/guest-session/   
sudo ls -la /usr/share/lightdm/guest-session/skel/   
sudo ls -la /usr/share/lightdm/guest-session/skel/.config/   
sudo ls -la /usr/share/lightdm/guest-session/skel/.config/autostart/   
sudo ls -la /usr/share/lightdm/guest-session/skel/.config/autostart/guest-session-startup.desktop   
</code>


====== /etc/guest-session/choose-language-wrapper.sh ======

<code>
#!/bin/sh -e

# show zenity dialog only when launched from greeter
ONLYGUEST=true
for U in $(users); do
    if [ "${U%%-*}" != 'guest' ]; then
        ONLYGUEST=false
        break
    fi
done

if $ONLYGUEST && [ -x /usr/bin/zenity ]; then
    guestlang=$( zenity --list --title 'Select language' \
      --text 'Select language for the guest session' --radiolist \
      --column 'Pick' --column '' TRUE 'English' FALSE 'French' )
    if [ "$guestlang" = 'English' ]; then
        echo 'export LANGUAGE=en_US' >> "$HOME/.profile"
        echo 'export LANG=en_US.UTF-8' >> "$HOME/.profile"
    elif [ "$guestlang" = 'French' ]; then
        echo 'export LANGUAGE=fr' >> "$HOME/.profile"
        echo 'export LANG=fr_FR.UTF-8' >> "$HOME/.profile"
    fi
fi

exec /usr/lib/lightdm/lightdm-guest-session "$@"
</code>


====== /usr/share/lightdm/guest-session/skel/.config/autostart/guest-session-startup.desktop ======
<code>
[Desktop Entry]
Name=Custom startup commands for LightDM guest session
Type=Application
NoDisplay=true
Exec=/usr/lib/lightdm/guest-session-auto.sh
X-Ubuntu-Gettext-Domain=lightdm
</code>


Migration 22.04 :

<code>
sudo snap remove firefox
sudo add-apt-repository ppa:mozillateam/ppa

echo '
Package: firefox*
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 1001
' | sudo tee /etc/apt/preferences.d/mozillateamppa

echo '
Unattended-Upgrade::Allowed-Origins:: "LP-PPA-mozillateam:${distro_codename}";
' | sudo tee /etc/apt/apt.conf.d/51unattended-upgrades-firefox

sudo apt update && sudo apt install firefox firefox-locale-fr
sudo snap remove chromium 
sudo add-apt-repository ppa:phd/chromium-browser

echo '
Package: *
Pin: release o=LP-PPA-phd-chromium-browser
Pin-Priority: 1001
' | sudo tee /etc/apt/preferences.d/phd-chromium-browser

sudo apt update && sudo apt install -y --allow-downgrades chromium-browser 
sudo nano /usr/share/applications/google-chrome.desktop 
sudo nano /usr/share/applications/chromium-browser.desktop 

sudo nano -cB /usr/lib/lightdm/guest-session-auto.sh 
</code>

{{ :tmp:guest-session-auto.sh.doc |}}

{{ :tmp:google-chrome.desktop.doc |}}

{{ :tmp:chromium-browser.desktop.doc |}}