Install php-gd (Required by php library to scan QR code) Install pdftk (For extracting FDF form data from pdf) poppler-utils (For pdfimages tool to extract images from pdf) Install qpdf to decrypt pdf (pdftk does not support AES256 encrypted PDFs https://gitlab.com/pdftk-java/pdftk/-/issues/87)
sudo apt-get install php-gd
sudo apt-get install pdftk
sudo apt-get install poppler-utils
sudo apt-get install tesseract-ocr
sudo apt-get install tesseract-ocr-chi-tra