Ubuntu

Troubleshoot (to test)

Tracker miner (since ubuntu 16)

systemctl --user mask tracker-extract-3.service tracker-miner-fs-3.service tracker-miner-rss-3.service tracker-writeback-3.service tracker-xdg-portal-3.service tracker-miner-fs-control-3.service
tracker3 reset -s -r
reboot

Source

Disable autostart Skype

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