Following instructions from "https://www.pgadmin.org/download/pgadmin-4-apt/" to install pgadmin4 on ubuntu 25.10, the command
sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/packages-pgadmin-org.gpg] https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/$(lsb_release -cs) pgadmin4 main" > /etc/apt/sources.list.d/pgadmin4.list && apt update'
errors out complaining there is no release file.