+* Upgrade the whole distribution to a newer release. For the examples above, that
+ could be Ubuntu 18.04 or 20.04, and CentOS 8 (or RHEL/CentOS derivatives like
+ AlmaLinux or Rocky Linux). This has the benefit to get the newest bug and
+ security fixes, often also new features, and moving the EOL date in the future.
+
+* Upgrade the Containers systemd version. If the distribution provides a
+ backports repository this can be an easy and quick stop-gap measurement.
+
+* Move the container, or its services, to a Virtual Machine. Virtual Machines
+ have a much less interaction with the host, that's why one can install
+ decades old OS versions just fine there.
+
+* Switch back to the legacy 'cgroup' controller. Note that while it can be a
+ valid solution, it's not a permanent one. There's a high likelihood that a
+ future {pve} major release, for example 8.0, cannot support the legacy
+ controller anymore.
+====
+
+[[pct_cgroup_change_version]]
+Changing CGroup Version
+^^^^^^^^^^^^^^^^^^^^^^^
+
+TIP: If file system quotas are not required and all containers support 'cgroupv2',