I'm using Ubuntu 12.04 along with a manually installed Cuda 6.5. I'm wondering if there is a risk doing apt-get upgrade? The question is: Does apt-get upgrade install some default Ubuntu Nvidia drivers which might mess up my system because they are conflicting with my manually installed Cuda 6.5?
Does anyone have experience with that? Cheers
As per this answer the automatic updates doesn't even know that the cuda 6.5 is installed nor any of its dependencies that were installed with it, so you are safe tu run an upgrade.
That being said, nothing is 100% certain, therefore take a full system back-up of your PC (you're definitely user type 4) and then proceed with the upgrade.
If the upgrade would fail, just restore the system back-up and you're back where you were!
