Gfilui

I currently have a package (opencv) installed twice on my Ubuntu 16.04 system. I only realized this was the case when a Python script ran with Spyder gave me this error:

OSError: libopencv_highgui.so.3.3: cannot open shared object file: No such file or directory

My usr/local/lib folder now looks like this:

libopencv_aruco.so libopencv_imgproc.so.3.3
libopencv_aruco.so.3.3 libopencv_imgproc.so.3.3.1
libopencv_aruco.so.3.3.1 libopencv_imgproc.so.3.4
libopencv_aruco.so.3.4 libopencv_imgproc.so.3.4.0
libopencv_aruco.so.3.4.1 libopencv_imgproc.so.3.4.1
[...]

The packages were initially installed following OpenCV's official installation guide, relying on cmake, make and on sudo make install commands.

The only build folder on my computer is now that of version 3.4.1. Running sudo make uninstall would remove it, but I actually need to remove 3.3.1 instead.

Is there a way to uninstall the earlier version?
Would it be the same as deleting all .3.3 and .3.3.1 files?

Alternatively, is there a way to tell Python to ignore the first installation and only use 3.4.1?

I think that the best way is to completely delete both version 3.4 and 3.3 and reinstall the 3.4 version.

To remove them try with

sudo rm -rf /usr/local/lib/libopencv_*
sudo rm -rf /usr/local/bin/opencv_*
sudo rm -rf /usr/local/include/opencv*
sudo rm -rf /usr/local/lib/pkgconfig/opencv.pc

To check if there are still some opencv components try a search with

sudo updatedb
locate opencv

If you don't have the updatedb/locate command I suggest you to install it with sudo apt install mlocate.

Then try to reinstall OpenCV 3.4