Aspose.Note appears to work on Linux but seems to require libgdiplus for even the most trivial OneNote file.
Alas libgdiplus is abandoned. See e.g. GitHub - mono/libgdiplus: C-based implementation of the GDI+ API · GitH…...Text ?? "(no title)"; Console.WriteLine($"\n---...GetChildNodes<RichText>()) { var text = richText.Text.Trim(); if (!string...