I think you have typed the command wrong.
The symbols around uname -r must be backticks (`) not quotes ('). The backtick key is next to the 1 key at the top left of the keyboard.
If you still can't get it to work, try changing `uname -r` to $(uname -r).
I think you have typed the command wrong.
The symbols around uname -r must be backticks (`) not quotes ('). The backtick key is next to the 1 key at the top left of the keyboard.
If you still can't get it to work, try changing `uname -r` to $(uname -r).