Qreator
Qreator is an Ubuntu app to easily create your own QR codes.
Encode different types of information in an efficient, compact and cool way.
Qreator is Open Source software, brought to you free of charge.
If you find it useful, you might consider contributing, sharing or just saying “Thanks” in the comments :)
You can also:
Note: there is a known bug that prevents Qreator from generating codes on Ubuntu 16.04. To work around it, you can install the latest Qreator version from the development PPA (Personal Package Archive, contains a newer version than the Ubuntu archive).
Simply open an terminal and type:
sudo add-apt-repository ppa:qreator-hackers/qreator-stable
sudo apt update
sudo apt install qreator python-qrencode
Once the version upgrade finishes, you should be able to use Qreator as usual.