Problems installing/uninstalling CUDA

Hi,

I installed cuda with a command

sudo apt install nvidia-cuda-toolkit

, which isntalled cuda 7.5. I tried to uninstall it, download newer CUDA 10.1 from official websites and installed it. It throws this error. Obviously the old and new versions of cuda are fighting but I was unable to uninstall them completely, still getting similar errors:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
cuda is already the newest version (10.1.168-1).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 cuda-libraries-dev-10-1 : Depends: libcublas-dev (>= 10.2.0.168) but it is not going to be installed
 cuda-samples-10-1 : Depends: libcublas-dev (>= 10.2.0.168) but it is not going to be installed
 cuda-visual-tools-10-1 : Depends: libcublas-dev (>= 10.2.0.168) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

I tried several ways of removing the libraries, all failed… Any help would be highly appreciated.

sudo apt remove libcublas* cuda* libnvblas* nvidia-cuda*

Please post the output of
sudo apt remove libcublas* cuda* libnvblas* nvidia-cuda*

Also try to just install the package by hand
sudo apt install libcublas-dev cuda-toolkit-10-1