systemd-run0 replaces sudo in Fedora 43 and Ubuntu 26.04.1 — what Linux administrators need to know before migrating

systemd 257 introduces run0, a sudo replacement that ditches the SUID bit for a Polkit and systemd-based privilege escalation mechanism. Fedora 43 and Ubuntu 26.04.1 enable it by default in August 2026. Here is what breaks, what changes, and how to prepare your Ansible playbooks.