There is no dropping out, and there’s no replacement. All political donations have been to the Biden campaign, it is illegal to transfer those funds to a new candidate. The only person who could run for president in his place is Kamala, since she is the other person on the ticket.
It’s extremely clear no one talking has any clue how any of this shit works.
apt remove sudo
sudo is not installed on several distributions by default, so hardly surprising it’s not there or that you can remove it.