You may face an error after the installation of Ubuntu 22.04 on your VPS Server with 512MB that says: "Kernel panic - not syncing: System is deadlocked on memory". 
The cause for this is that Ubuntu 22.04 requires at least 1 GB RAM. Ubuntu has changed the system requirements for Ubuntu 22.04 to 1 GB RAM.
Solution: Upgrade your VPS Server to 1GB or more or install an older or newer version of Ubuntu.
