Ubuntu

Troubleshoot (to test)

Tracker miner (since ubuntu 16)

gsettings set org.freedesktop.Tracker3.Miner.Files crawling-interval -2  
gsettings set org.freedesktop.Tracker3.Miner.Files enable-monitors false
tracker3 reset --filesystem --rss

echo -e "\nHidden=true\n"|sudo tee --append /etc/xdg/autostart/tracker-extract.desktop
echo -e "\nHidden=true\n"|sudo tee --append /etc/xdg/autostart/tracker-miner-apps.desktop
echo -e "\nHidden=true\n"|sudo tee --append /etc/xdg/autostart/tracker-miner-fs.desktop
echo -e "\nHidden=true\n"|sudo tee --append /etc/xdg/autostart/tracker-miner-user-guides.desktop
echo -e "\nHidden=true\n"|sudo tee --append /etc/xdg/autostart/tracker-store.desktop

Disable autostart Skype

~/snap/skype/current/.config/autostart/skypeforlinux.desktop

~/snap/skype/common/.config/autostart/skypeforlinux.desktop

Settings -> General -> "Automatically start Skype".

My fast setup

Ublock

firefox https://addons.mozilla.org/fr/firefox/addon/ublock-origin/

Rustdesk secure

firefox https://github.com/rustdesk/rustdesk/releases
#sudo systemctl disable rustdesk.service
#sed -ri 's/^(Exec=).*/\1sh -c "pgrep rustdesk || (rustdesk --service & rustdesk; killall rustdesk;)"'

As root

apt update
apt dist-upgrade -y
apt-get install ubuntu-restricted-extras vlc numlockx $(check-language-support) -y
apt remove totem --autoremove -y
sed -i 's/^\(Prompt=\).*/\1never/' '/etc/update-manager/release-upgrades'
gsettings get org.gnome.desktop.lockdown disable-lock-screen