AppImageBuilder.script.ExecutionFailed (exited with code 2) about appimage-builder HOT 3 CLOSED

Hi!
This is an issue with pip, it seems that the version you are using doesn't support the --system argument. Just remove it from your pip call:
python3 -m pip install --ignore-installed --prefix=/usr --root=AppDir -r ./requirements.txt

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This helped, but another error appeared:

WARNING:script: ERROR: Could not find a version that satisfies the requirement ffmpeg-4.2.4 (from -r ./requirements.txt (line 1)) (from versions: none)
WARNING:script: ERROR: No matching distribution found for ffmpeg-4.2.4 (from -r ./requirements.txt (line 1))

(But if I remove the ffmpeg version, then the ffmpeg-1.4 version is installed, which is very outdated.)

And also the program can't find mkvtoolnix:

WARNING:script: ERROR: Could not find a version that satisfies the requirement mkvtoolnix (from -r ./requirements.txt (line 3)) (from versions: none)
WARNING:script: ERROR: No matching distribution found for mkvtoolnix (from -r ./requirements.txt (line 3))

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Those are still pip related issues.
I'm not a pip expert, I suspect that pip is not downloading the dependencies right. You can try running appimage-builder from a virtualenv whit a good pip setup. Try installing those package manually then run appimage-builder.

Notice that it's recommended to use Ubuntu 18.04 or 20.04 for better results.

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