ImportError: libSM.so.6: cannot open shared object file: No such file or directory

Solution 1:

This fixed the problem by having it as the first two lines of the script:

!pip install opencv-python
!apt update && apt install -y libsm6 libxext6
!apt-get install -y libxrender-dev

Solution 2:

You need to add sudo . I did the following to get it installed :

sudo apt-get install libsm6 libxrender1 libfontconfig1

and then did that (optional! maybe you won't need it)

sudo python3 -m pip install opencv-contrib-python

FINALLY got it done !

Solution 3:

For CentOS, run this: sudo yum install libXext libSM libXrender