I have a problem with the new version of Ubuntu. I used to have Ubuntu 18.04 LTS version, but I decided to change to the normal version and update it to Ubuntu 18.10. Since then I can't turn the keyboard backlight on.

I have already tried to open a terminal and type: `xset led 1` ... `xset led 32`, but it doesn't work. I have also tried to turn it on by pressing `Fn`+`F4` and that shows the picture of the keyboard backlight but without the blue progressbar.

[![Fn+F4](https://i.stack.imgur.com/dZyYR.png)](https://i.stack.imgur.com/dZyYR.png)

Does somebody know how I could fix it or what the problem is?