I’m sorry to tell you that your NVIDIA GT218M / NVS 3100M is considered to be a “Legacy GPU” by nVidia so no current proprietary drivers are available so you took the right choice to install the open source Nouveau driver.
However, your card is also so old and so slow that it gets detected as a software renderer using Nouveau.
You only have 5 options here:
- Hope that there is a developer out there that has the same card as you and that is working on optimizing the Nouveau driver to squeeze out the most of your old card
- Get involved in Nouveau development yourself
- Upgrade the card
-
Try the
video-nvidia-390xxlegacy driver instead of Nouveau (Not guaranteeing anything; make a full system backup before you start fiddling with display drivers!) - Live with what you have
P.S. To get rid of the warning, set the rendered to “software”. 