# PTB for GNU Octave in Ubuntu 22.04

**URL:** <https://psychtoolbox.discourse.group/t/ptb-for-gnu-octave-in-ubuntu-22-04/4409>\
**Category:** Programming Help\
**Tags:** linux\
**Created:** [May 6, 2022, 12:59pm UTC](https://psychtoolbox.discourse.group/t/ptb-for-gnu-octave-in-ubuntu-22-04/4409 "2022-05-06T12:59:03Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\
**Post date:** [May 13, 2022, 4:47pm UTC](https://psychtoolbox.discourse.group/t/ptb-for-gnu-octave-in-ubuntu-22-04/4409/12 "2022-05-13T16:47:53Z")

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From previous advice, citing myself:

Make sure to login into a GUI session that is X11/Xorg based, **not** Wayland based, or you will end with the Wayland nightmare of just blank black screens and a hang, cfe. [Screen(‘OpenWindow’) and PsychImaging(‘OpenWindow’) produce black screen - #6 by mariokleiner](https://psychtoolbox.discourse.group/t/screen-openwindow-and-psychimaging-openwindow-produce-black-screen/4361/6)

Currently you seem to have v3.0.18.4 from Ubuntu itself, and that version lacks automatic Wayland detection and troubleshooting for this problem → Don’t use Wayland, use a Xorg/X11 GUI session. This should make visual stimulation working.

~~Yesterday I got feedback from Yaroslav Halchenko of team NeuroDebian that they currently can’t provide updated packages via NeuroDebian for Ubuntu 22.04-LTS due to some technical problems. That’s a pity as i want people to upgrade to Ubuntu 22.04-LTS, it has substantial improvements for neuroscience applications, and NeuroDebian would be the most convenient method for that. But it is what it is…~~

~~Therefore, for the time being, it would be best if you’d use the `DownloadPsychtoolbox` method as described on our website under “Subversion-based installation”, to get the latest 3.0.18.9 release, and then `UpdatePsychtoolbox` as needed, iow. the same procedure as when using MS-Windows or macOS.~~

**EDIT: Yaroslav found a solution, and I’m pleased to report that the latest PTB 3.0.18.9 is now available from NeuroDebian for Ubuntu 22.04-LTS.** There won’t be any support for the outdated Ubuntu 21.10 though, as that reaches end of life in 2 months anyway, so no point in providing packages for it.

-mario

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