# GLEW could not be initialized: Missing GL version ubuntu 20.04

**URL:** https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870
**Category:** Support
**Tags:** python
**Created:** [March 3, 2023, 12:03pm UTC](https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870 "2023-03-03T12:03:27Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![sotodela](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sotodela/32/6513_2.png) [@sotodela](https://discourse.vtk.org/u/sotodela)
#### Post date: [March 3, 2023, 12:03pm UTC](https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870/1 "2023-03-03T12:03:27Z")

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Hi,

Previously I was able to run my programs using vtk on python 3.8, after installing GPU drivers it stopped working and I get the error message “ERR| vtkXOpenGLRenderWindow (0x5194010): GLEW could not be initialized: Missing GL version” . I tried already what is suggested here : [issue with vtkOpenGLRenderWindow on linux with vtk=9.1 - #5 by dgobbi](https://discourse.vtk.org/t/issue-with-vtkopenglrenderwindow-on-linux-with-vtk-9-1/8576/5), and the cylinder example works fine.

I am using vtk version 9.1.0 and the drivers I am using for OpenGL:  
OpenGL vendor string: NVIDIA Corporation  
OpenGL renderer string: Quadro P2200/PCIe/SSE2  
OpenGL core profile version string: 4.6.0 NVIDIA 525.85.12

What could be the problem?

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<div class="post-metadata">

### Author: ![Aron\_Helser](https://discourse.vtk.org/user_avatar/discourse.vtk.org/aron_helser/32/14_2.png) [@Aron\_Helser](https://discourse.vtk.org/u/Aron_Helser)
#### Post date: [March 3, 2023, 8:36pm UTC](https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870/2 "2023-03-03T20:36:35Z")

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Just a guess, did you reboot after installing the drivers?

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### Author: ![zhang-qiang-github](https://discourse.vtk.org/user_avatar/discourse.vtk.org/zhang-qiang-github/32/2519_2.png) [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [March 4, 2023, 10:10am UTC](https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870/3 "2023-03-04T10:10:05Z")

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I met this problem before. Twice !!! And it really make me crazy.

I will introduce the two experience.

The first time, the GPU is incorrect. My system is `windows server 2019`， but my `GPU` is incorrect for `windows server`. So, you must make sure whether the GPU can be used for ubuntu.

For the second time, my GPU driver is incorrect. The used driver is download from [this](https://www.nvidia.com/download/index.aspx#), and it is:

 ![image](https://discourse.vtk.org/uploads/default/original/2X/4/4046076a054405aa3f7f46eba2cc78ef0dd8170d.png)

And the correct driver is download from [this](https://www.nvidia.com/download/find.aspx#), and it is:

 ![image](https://discourse.vtk.org/uploads/default/original/2X/4/419e93e6839d82e4df42b865dd82f1884e47874e.png)

The `Standard` is necessary.

Hope it helps.

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<div class="post-metadata">

### Author: ![sotodela](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sotodela/32/6513_2.png) [@sotodela](https://discourse.vtk.org/u/sotodela)
#### Post date: [March 8, 2023, 7:45pm UTC](https://discourse.vtk.org/t/glew-could-not-be-initialized-missing-gl-version-ubuntu-20-04/10870/4 "2023-03-08T19:45:47Z")

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Thanks! I will reinstall the drivers and try it out again.