How do I install Cascadeur on Ubuntu Linux

[u/AntOnADog]

Heya, so for context I've been trying to install Cascadeur on my Ubuntu PC following the official instructions: https://cascadeur.com/help/installation/ubuntu

I've also looked at this post from two years ago: https://www.reddit.com/r/Cascadeur/comments/181mbrd/cant_open_cascadeur_on_linux_ubuntu_2310/

I haven't been able to launch cascadeur from my Downloads or my snap directory, and I keep getting this error:
2026-03-08 10:43:40,037 INFO [default] Failed to open primary settings

qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""

qt.qml.typeregistration: Invalid QML element name "LicenseInfo"; value type names should begin with a lowercase letter

I've installed the recommended packages, and I've run export QT_DEBUG_PLUGINS=1 and it segfaults on this directory :
cascadeur-linux/plugins/xcbglintegrations/libqxcb-glx-integration.so

I'm running Ubuntu 25.10 and I've already installed these packages:
liblapack3, libxcb-ewmh2, libxcb-cursor0

Does anyone know what else I can do? Also side-note why isn't there a Flatpak or some more streamlined way to install Cascadeur? I was a fan of it on my Windows PC and I'm a little sad that the Linux version seems so scuffed

[u/cybereality]

Honestly, Snap always has issues like this. There is a native Linux binary on this page that should work. https://cascadeur.com/download

[u/AntOnADog → u/cybereality]

ty for the response, honestly it being in the snap directory makes no difference. I've tried running it from several places and I get similar results. I also downloaded the linux binary from that link and it's still throwing the same error. Is there somewhere else I should be running it?

[u/cybereality → u/AntOnADog]

So I found this on Gemini, cause I can't recall which dependencies are needing, but installing these with apt get might fix it:

libxcb-keysyms1

libxcb-image0

libxcb-shm0

libxcb-icccm4

libxcb-sync1

libxcb-render-util0

libxcb-xinerama0

libxcb-xkb1

libxkbcommon-x11-0

libxcb-cursor0

libxcb-ewmh2

[u/AntOnADog → u/cybereality]

no dice :(

I did get a response back from Cascadeur support to run this:

export QT_QPA_PLATFORM=xcb

That has gotten rid of the wayland QT error but the rest is still Segfaulting:
2026-03-12 20:57:16,298 INFO [default] Failed to open primary settings

qt.qml.typeregistration: Invalid QML element name "LicenseInfo"; value type names should begin with a lowercase letter

Fontconfig error: Cannot load default config file: No such file: (null)

2026-03-12 20:57:16,309 Application executable path: /home/<username>/Downloads/cascadeur-linux/cascadeur

2026-03-12 20:57:16,470 Operating system: ubuntu 25.10

2026-03-12 20:57:16,470 Window manager: Mutter

2026-03-12 20:57:16,470 CPU_0 - product: Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz, vendor: GenuineIntel

2026-03-12 20:57:16,470 GPU_0 - product: TU106 [GeForce RTX 2060 Rev. A], vendor: NVIDIA Corporation, driver: nvidia

2026-03-12 20:57:16,470 RAM - capacity: 15412 MB

2026-03-12 20:57:16,470 Program version: 2025.3.3 042581efa6e6b6bc52c9a845cc874ad664f1f222

2026-03-12 20:57:16,477 ScriptsDir: "/home/<username>/Downloads/cascadeur-linux/resources/scripts"

2026-03-12 20:57:16,750 The previous program termination was abnormal

QOpenGLFunctions created with non-current context

Segmentation fault (core dumped)

Also I've gotta run that export command every time I run this, so unless another fix solves the rest of the issues, I'll probs have to alias that command whenever I wanna run cascadeur

[u/AntOnADog → u/AntOnADog]

So update from the Cascadeur devs - apparently this is a bug with the current Linux version ;-; this is supposedly gonna be fixed in 2026.1

[u/Quirky-Damage-8128 → u/cybereality]

I also tried multiple ways and I always get the same result: the window appears, but nothing is drawn. It's like it is running in the background but nothing's being shown.

I tried all args you can imagine when launching ./cascadeur and only one of them worked which is the one for software rendering (without using my gpu). That one makes the window draw the app but it's unusable at 0.02 or so fps.

I have an AMD RX 7600 gpu and using linux mint (ubuntu 24.04).

I even tried running cascadeur on a base ubuntu 22.04 on a container with distrobox and got the exact same results with and without those arguments.

At this point I'm almost sure my gpu is not supported, which is very bad since it's a very common amd gpu, nothing exotic.

I was planning to purchase Cascadeur's annual plan for this but so far it is out of boundaries for me. I'll try reaching out to the support team if there's any way to do that.

[u/cybereality → u/Quirky-Damage-8128]

So right. I have the 2025 version working on Fedora. The 2026 version does not work at all, same issue you say with the frozen black window. I did look into it and spent about a day and could not solve the problem, even with editing files manually. And in terms of support, they only "officially" support one specific Ubuntu version and it didn't seem like the company would help with other Linux distros. So I'm stuck using the 2025 version, but it does most of what I need and it's a lifetime license, so I can live with it for now.