I have the dell xps laptop with ubuntu.
The f keys on the keyboard have specific shortcuts relating to the picture on the keys - to vary brightness of turn on the illumination under the keys.
I'm not sure how but these default f key shortcuts seem to have been replaced with other ones - only the f key ones, the rest of the shortcuts are unchanged. For instance F11 which used to reduce screen brightness now makes a web page full screen.
I know it is possible to define keyboard shortcuts in system settings but many of them are not there and I don't want to have to create custom commands.
It seems like I might have accidentally pressed another keyboard shortcut which toggled the shortcuts only for the f keys.
How can I reset the f key shortcuts to what they were before?