Install ubuntu 20.04 on a graphics laptop On boot menu choose ubuntu (safe graphics) By doing this the installer doesn't crash nvidia server is installed for this mode automatically (Make sure you are connected to internet at time of installation) To enable fingerprint Execute below lines
sudo sh -c 'cat > /etc/apt/sources.list.d/focal-dell.list << EOF
deb http://dell.archive.canonical.com/updates/ focal-dell public
deb http://dell.archive.canonical.com/updates/ focal-oem public
deb http://dell.archive.canonical.com/updates/ focal-somerville public
deb http://dell.archive.canonical.com/updates/ focal-somerville-melisa public