The documented minimum system requirements are at:
It specifies 4GB as the minimum amount of required RAM.
However, on an Ubuntu 22 machine with 4GB RAM + 4GB swap, the SDK 5.0 installer consistently runs out of memory during the model optimization process, causing it to freeze.
Increasing the system memory to 8GB RAM + 12GB swap allows the installer to run. I am not sure what the peak actual memory usage of the installer is at the moment, but 4GB is inadequate.