install python3.7 on ubuntu 20

 sudo add-apt-repository ppa:deadsnakes/ppa

sudo apt-get update

sudo apt-get install python3.7

Managing cuda version for different Tensorflow version

Tensorflow 1.15.0 or 1.14.0 may require cuda 10.0 or 10.1

And your latest version of Tensorflow 2.x use cuda 11.1 or 11.0

At this situation, you need to set proper path setting.

refer to below command

>sudo nano ~/.profile

# set PATH for cuda 10.0 installation
if [ -d "/usr/local/cuda-10.0/bin/" ]; then
export PATH=/usr/local/cuda-10.0/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-10.0/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

# set PATH for cuda 10.1 installation
if [ -d "/usr/local/cuda-10.1/bin/" ]; then
export PATH=/usr/local/cuda-10.1/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-10.1/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

# set PATH for cuda 11.2 installation
if [ -d "/usr/local/cuda-11.2/bin/" ]; then
export PATH=/usr/local/cuda-11.2/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-11.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

reboot after saving

Thank you.