# Opacity problem on Ubuntu 20.04 LTS

**URL:** https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885
**Category:** ParaView Support
**Created:** [November 25, 2020, 10:56am UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885 "2020-11-25T10:56:47Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![safranyikf](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/35a633/32.png) [@safranyikf](https://discourse.paraview.org/u/safranyikf)
#### Post date: [November 25, 2020, 10:56am UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885/1 "2020-11-25T10:56:47Z")

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Dear All,

I have a big trouble with ParaView 5.7.0 on Ubuntu 20.04 LTS. When I would like to change opacity of the surfaces imported from .stl the surface immediately disappears.

Before updating the OS from Ubuntu 18.04 LTS I did not faced this problem (ParaView 5.4.1 was used). Reason of the update was that I would like to use the Gaussian Points representation of point Cloud in ParaView 5.7.0.

I am relatively new Linux user thus I do not have strong base knowledge related to Ubuntu.

Thanks in advance, Feri

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 25, 2020, 1:18pm UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885/2 "2020-11-25T13:18:28Z")

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Please try with our last release of ParaView:  
[https://www.paraview.org/download/](https://www.paraview.org/download/)

Alternatively, make sure you are using your GPU.

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### Author: ![safranyikf](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/35a633/32.png) [@safranyikf](https://discourse.paraview.org/u/safranyikf)
#### Post date: [November 25, 2020, 4:04pm UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885/3 "2020-11-25T16:04:08Z")

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Exactly the same problem with versio 5.9.0-RC1.

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 26, 2020, 1:59pm UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885/4 "2020-11-26T13:59:18Z")

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Please copy and poste the Help -\> About dialog content.

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### Author: ![safranyikf](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/35a633/32.png) [@safranyikf](https://discourse.paraview.org/u/safranyikf)
#### Post date: [December 2, 2020, 9:21am UTC](https://discourse.paraview.org/t/opacity-problem-on-ubuntu-20-04-lts/5885/5 "2020-12-02T09:21:27Z")

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It is interesting, but 5.9.0 was downloaded, then I tryed to start version 5.4.1 which was worked well and I could use the Gaussian Points representation as well. I do not really understand what is happened, but now it is working…