How to install startup disk creator in Ubuntu 19.04
To install the application, run the following commands:
sudo apt update
sudo apt install usb-creator-gtk
Additionally, if you are running KDE or Kubuntu instead of Ubuntu or Ubuntu Gnome, then you should probably use usb-creator-kde instead of usb-creator-gtk:
sudo apt update
sudo apt install usb-creator-kde
Furthermore, if you are using LXQT on Lubuntu, then you probably want to use usb-creator-kde.