Running app on 64 bit Linux

For those who want to run grblControl (which is 32-bit executable) under 64-bit Linux OS (in my case Debian 10), you have to add support for i386 applications and install required libraries, otherwise you get No such file or directory error when trying to run the application from terminal.

Run these commands:

sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libc6:i386 libgl1:i386 libgtk2.0-0:i386 libsm6:i386

That should do the trick.