usb-creator learns to install standard linux from running linux

[SoloTurn]

as usb drives are available at reasonable prices now, they can easy hold a standard linux, not only a squashed one. it would be great if a running ubuntu would allow to easy install linux on an usb drive. currently this is a little tedious via e.g. debootstrap: https://help.ubuntu.com/community/Installation/FromLinux#Without_CD

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: usb-creator-gtk 0.2.40ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic i686
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
Date: Sun Jan 6 11:59:01 2013
InstallationDate: Installed on 2012-12-09 (28 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: usb-creator
UpgradeStatus: No upgrade log present (probably fresh install)

[SoloTurn (soloturn)]

while not easy to find in the current documentation, and crasching with ubuntu-14.10, ubiquity does exactly this.