How to clean up GRUB?

[dodo]

Hm, after running these commands in terminal, looks like there is some kind of error

i copied:

Code:

kucni-kompjuter@KucniKompjuter-Linux:~$ sudo add-apt-repository ppa:danielrichter2007/grub-customizer
[sudo] password for kucni-kompjuter:
You are about to add the following PPA to your system:
This PPA contains the latest release of Grub Customizer.

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer
More info: https://launchpad.net/~danielrichter2007/+archive/grub-customizer
Press [ENTER] to continue or ctrl-c to cancel adding it
sudo apt-get update
gpg: keyring `/tmp/tmpJt7VKD/secring.gpg' created
gpg: keyring `/tmp/tmpJt7VKD/pubring.gpg' created
gpg: requesting key 3F055C03 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpJt7VKD/trustdb.gpg: trustdb created
gpg: key 3F055C03: public key "Launchpad PPA for Daniel Richter" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK
kucni-kompjuter@KucniKompjuter-Linux:~$ sudo apt-get install grub-customizer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package grub-customizer
kucni-kompjuter@KucniKompjuter-Linux:~$

excuse my newbieness  :