Common steps (Read first!)

Setting up Rootless Containers doesn’t need the root privileges basically, but some specific configuration may need the root for the initial set-up.

• Logging in
• /etc/subuid and /etc/subgid
• [Optional] cgroup v2
• [Optional] Configuring sysctl values
• [Optional] Configuring AppArmor (Ubuntu 24.04 or later)