For best render performance and more free VRAM I installed Blender on an Ubuntu server without GUI.
I launched Blender from the command line using argument and all was OK, but after installing it uses CPU render for Cycles and I wanted to use GPU render.
Without GUI I do not understand how to switch to it and how I can set tile size of render region (to get the best performance).
I tried to replace userconfig.blend with GPU setting but Blender still renders using CPU.
I also tried to set global variation
BLENDER_USER_CONFIG="path to userconfig.blend file with GPU setting, or to run Blender on Ubuntu desktop mounting Blender folder from Ubuntu server and blender still uses CPU.