Tesseract is easy to install on Debian. Just follow documentation https://tesseract-ocr.github.io/tessdoc/Installation.html or https://notesalexp.org/tesseract-ocr/.
I doubt .NET wrapper will work on Debian (https://github.com/charlesw/tesseract/issues?q=is%3Aissue%20state%3Aopen%20linux).