place in /etc/apt/

gpg_keys.txt

sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 5044912E
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 614C4B38
wget -q https://dl-ssl.google.com/linux/linux_signing_key.pub -O- | sudo apt-key add -
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1378B444
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A1F196A8
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FC91AE7E
wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
wget http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -
 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9CB8DB0

sources.list

# FROM: https://repogen.simplylinux.ch/generate.php

#------------------------------------------------------------------------------#
#                           UNOFFICIAL UBUNTU REPOS                            #
#------------------------------------------------------------------------------#


###### 3rd Party Binary Repos

#### Dropbox - http://dropbox.com
## Run this command: sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 5044912E
deb http://linux.dropbox.com/ubuntu/ trusty main

#### Gimp PPA - https://launchpad.net/~otto-kesselgulasch/+archive/gimp
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 614C4B38
deb http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu trusty main

#### Google Earth - http://www.google.com/linuxrepositories/
## Run this command: wget -q https://dl-ssl.google.com/linux/linux_signing_key.pub -O- | sudo apt-key add -
deb http://dl.google.com/linux/earth/deb/ stable main

#### LibreOffice PPA - http://www.documentfoundation.org/download/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1378B444
deb http://ppa.launchpad.net/libreoffice/ppa/ubuntu trusty main

#### Oracle Java (JDK) Installer PPA - http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

#### Pidgin PPA - http://pidgin.im
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A1F196A8
deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu trusty main

#### UNetbootin PPA - http://unetbootin.sourceforge.net/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FC91AE7E
deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu trusty main

#### VirtualBox - http://www.virtualbox.org
## Run this command: wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
deb http://download.virtualbox.org/virtualbox/debian trusty contrib

#### Webmin - http://www.webmin.com
## Run this command: wget http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -
deb http://download.webmin.com/download/repository sarge contrib

#### Wine PPA - https://launchpad.net/~ubuntu-wine/+archive/ppa/
## Run this command:  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9CB8DB0
deb http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main


####### 3rd Party Source Repos

#### Gimp PPA (Source) - https://launchpad.net/~otto-kesselgulasch/+archive/gimp
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 614C4B38
deb-src http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu trusty main

#### LibreOffice PPA (Source) - http://www.documentfoundation.org/download/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1378B444
deb-src http://ppa.launchpad.net/libreoffice/ppa/ubuntu trusty main

#### Oracle Java (JDK) Installer PPA (Source) - http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

#### Pidgin PPA (Source) - http://pidgin.im
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A1F196A8
deb-src http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu trusty main

#### UNetbootin PPA (Source) - http://unetbootin.sourceforge.net/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FC91AE7E
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu trusty main

#### Wine PPA (Source) - https://launchpad.net/~ubuntu-wine/+archive/ppa/
## Run this command:  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9CB8DB0
deb-src http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main