[Doitsu]

Originally Posted by philja

I posted a query on github.com/flathub/com.sigil_ebook.Sigil/issues/23 asking whether the flatpak version was not allowing the plugin to use xclip and xsel.

It might be possible to change to plugin code to use the built-in Qt6 library for all platforms.
Install the CCTest edit plugin and run it. It should copy 'Lorem ipsum dolor sit amet, consectetur adipiscing elit' to the clipboard. If the plugin works on your Linux machine, it'll be easy to update the plugin code of the SVG wrapper plugin.

Here's the code of the CCTest plugin:

Spoiler:

#!/usr/bin/env python
 # -*- coding: utf-8 -*-
import sys
from plugin_utils import PluginApplication

def run(bk):
    app = PluginApplication(sys.argv, bk)
    app.clipboard().setText('Lorem ipsum dolor sit amet, consectetur adipiscing elit')
    print('Text copied to the clipboard')

    return 0

def main():
    print('I reached main when I should not have\n')
    return -1

if __name__ == "__main__":
    sys.exit(main())