Hello all, I need to change my bootloader specs and change windows to the default value and I also want to change the time..

I've been searching on web and I've found Grub2 customizer.

to install it, I've simply to stroke a few keys from the cmd line.

add-apt-repository ppa:danielrichter2007/grub-customizer
apt-get update
apt-get install grub-customizer
although I get the following message during this process


root@localhost:~# add-apt-repository ppa:danielrichter2007/grub-customizer
bash: add-apt-repository: command not found


how I solve this problem?

Cheers