My YunoHost server
Hardware: Raspberry Pi at home
YunoHost version: 11.2.4
I have access to my server : Through SSH | through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no
If your request is related to an app, specify its name and version: Tracim v1.0~ynh1
Description of my issue
I want to install tracim on my freshly installed Yunohost instance on a raspberry pi 4. I have access and the installation works since I have other apps which do work.
When trying to install Tracim I get the following error message:
023-09-12 08:32:18,473: DEBUG - WARNING: You are using pip version 21.1.3; however, version 23.2.1 is available.
2023-09-12 08:32:18,474: DEBUG - You should consider upgrading via the '/var/www/tracim/backend/env/bin/python3 -m pip install --upgrade pip' command.
2023-09-12 08:32:19,290: DEBUG - + ynh_exec_warn_less pip install -r requirements-full-preview-generator.txt
2023-09-12 08:32:19,290: DEBUG - + [[ 4 -eq 1 ]]
2023-09-12 08:32:19,291: DEBUG - + pip install -r requirements-full-preview-generator.txt
2023-09-12 08:32:20,329: DEBUG - Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2023-09-12 08:32:21,209: DEBUG - ERROR: Could not find a version that satisfies the requirement vtk==9.1.0 (from versions: none)
2023-09-12 08:32:21,209: DEBUG - ERROR: No matching distribution found for vtk==9.1.0
2023-09-12 08:32:21,218: DEBUG - WARNING: You are using pip version 21.1.3; however, version 23.2.1 is available.
2023-09-12 08:32:21,219: DEBUG - You should consider upgrading via the '/var/www/tracim/backend/env/bin/python3 -m pip install --upgrade pip' command.
2023-09-12 08:32:21,398: DEBUG - + ynh_exit_properly
2023-09-12 08:32:21,399: DEBUG - + [[ install =~ ^install$|^upgrade$|^restore$ ]]
2023-09-12 08:32:22,911: ERROR - Unable to install tracim: An error occurred inside the app installation script
Is this an issue with my installation or with the image for raspberry pi? Tracim did work in my test environment (in a virtualbox)?
specifically my question is: how should I proceed to install the app?
Thanks in advance for any help offered 
Modèle de message (français)
Mon serveur YunoHost
Matériel: Raspberry Pi à la maison
Version de YunoHost: 11.2.4
J’ai accès à mon serveur : En SSH | Par la webadmin
Êtes-vous dans un contexte particulier ou avez-vous effectué des modificiations particulières sur votre instance ? : non
Si votre requête est liée à une applicatio, précisez son nom et sa version: Tracim
Description du problème
Je souhaite installer tracim sur mon instance Yunohost fraîchement installée sur un raspberry pi 4. J’ai l’accès et l’installation fonctionne puisque j’ai d’autres applications qui fonctionnent.
Lorsque j’essaie d’installer Tracim, j’obtiens le message d’erreur suivant:
023-09-12 08:32:18,473: DEBUG - WARNING: You are using pip version 21.1.3; however, version 23.2.1 is available.
2023-09-12 08:32:18,474: DEBUG - You should consider upgrading via the '/var/www/tracim/backend/env/bin/python3 -m pip install --upgrade pip' command.
2023-09-12 08:32:19,290: DEBUG - + ynh_exec_warn_less pip install -r requirements-full-preview-generator.txt
2023-09-12 08:32:19,290: DEBUG - + [[ 4 -eq 1 ]]
2023-09-12 08:32:19,291: DEBUG - + pip install -r requirements-full-preview-generator.txt
2023-09-12 08:32:20,329: DEBUG - Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2023-09-12 08:32:21,209: DEBUG - ERROR: Could not find a version that satisfies the requirement vtk==9.1.0 (from versions: none)
2023-09-12 08:32:21,209: DEBUG - ERROR: No matching distribution found for vtk==9.1.0
2023-09-12 08:32:21,218: DEBUG - WARNING: You are using pip version 21.1.3; however, version 23.2.1 is available.
2023-09-12 08:32:21,219: DEBUG - You should consider upgrading via the '/var/www/tracim/backend/env/bin/python3 -m pip install --upgrade pip' command.
2023-09-12 08:32:21,398: DEBUG - + ynh_exit_properly
2023-09-12 08:32:21,399: DEBUG - + [[ install =~ ^install$|^upgrade$|^restore$ ]]
2023-09-12 08:32:22,911: ERROR - Unable to install tracim: An error occurred inside the app installation script
Est-ce un problème avec mon installation ou avec l’image pour raspberry pi ?
Tracim a fonctionné dans mon environnement de test (dans une boîte virtuelle) ?Ma question est donc la suivante : comment dois-je procéder pour installer l’application ?
Merci d’avance pour toute aide
full logs: https://paste.yunohost.org/raw/goqerehevu