Grub Customizer Terminal install hangs up

I've tried to install Grub Customizer using Terminal and the installation always hangs up at this point:

john@john-GA-890GPA-UD3H:~$ sudo add-apt-repository ppa:danielrichter2007/grub-customizer
[sudo] password for john:
 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/ubuntu/grub-customizer
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keyring `/tmp/tmplouy2d55/secring.gpg' created
gpg: keyring `/tmp/tmplouy2d55/pubring.gpg' created
gpg: requesting key 3F055C03 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmplouy2d55/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
john@john-GA-890GPA-UD3H:~$ sudo apt-get update
Ign http://ppa.launchpad.net trusty InRelease
Ign http://ppa.launchpad.net trusty InRelease
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Ign http://ppa.launchpad.net trusty/main Translation-en_US
Ign http://ppa.launchpad.net trusty/main Translation-en
Ign http://ppa.launchpad.net trusty/main Translation-en_US
Ign http://ppa.launchpad.net trusty/main Translation-en
74% [Connecting to us.archive.ubuntu.com (2001:67c:1562::14)] [Connecting to security.ubuntu.com (2001:67c:1562::13)]
74% [Connecting to us.archive.ubuntu.com (2001:67c:1562::17)] [Connecting to security.ubuntu.com (2001:67c:1562::16)]

John