For PDF Tools, Image Compressor, Image To Text to work as expected. You need to install some packages below:
For Ubuntu 18 or 20:
sudo apt-get update -y
sudo apt-get install libreoffice jpegoptim optipng pngquant tesseract-ocr -y
For CentOS 7:
yum update -y
yum install libreoffice jpegoptim optipng pngquant tesseract -y
For CentOS 8:
yum update -y
yum install jpegoptim optipng pngquant tesseract -y
yum install libreoffice*
Happy using SumoWebTools!