delete old installer, fix typos on libraries

	deleted:    ubuntu-packages-installer
	modified:   ubuntu_libraries/code_and_text_editors.sh
	modified:   ubuntu_libraries/customization-packages-lubuntu.sh
	modified:   ubuntu_libraries/distro-modding-and-live-usb.sh
	modified:   ubuntu_libraries/install_codecs.sh
	modified:   ubuntu_libraries/install_kernel-headers_and_infrastructure.sh
	modified:   ubuntu_libraries/internet-applications.sh
	modified:   ubuntu_libraries/media-tools.sh
	modified:   ubuntu_libraries/office-tools.sh
	modified:   ubuntu_libraries/system_tools.sh
	modified:   ubuntu_libraries/ubuntu_and_debian_package-management.sh