How to Install gtkmm30-3.22.2-2.fc28.i686
in Fedora Operting System- Explained

1. Open the terminal. (Ctrl+Alt+T)

2. Enter the following commands in the terminal:

sudo dnf install gtkmm30-3.22.2-2.fc28.i686
.rpm
sudo dnf upgrade

3. gtkmm30-3.22.2-2.fc28.i686
is now installed.

In case you get any error while installing the package, try the commands given below and repeat the previous commands


sudo dnf erase gtkmm30-3.22.2-2.fc28.i686
.rpm
sudo dnf upgrade


In case you need any assistance in installing the package, please feel free to write to us.