Say I have Ubuntu installed in a hard drive
What can I do to generate a liveUSB that is as similar as possible to the installation ?
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(similar to http://askubuntu.com/questions/158784/make-a-live-usb-of-your-installed-ubuntu , but there, he wants a kiosk instalation of ubuntu, and accepts other alternatives that dont involve liveUSB) – josinalvo Jul 03 '12 at 00:35
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I recommend using Remastersys.
This will create a hardware-independent LiveCD ISO backup of your system; you can then use a tool such as Unetbootin to "burn" the ISO to a USB and create a LiveUSB.
Remastersys includes both command-line and GUI front-ends. Note that the author recommends starting with a "clean" install and then customizing it to maintain the highest compatibility for the LiveCD/LiveUSB. There is also a 4GB final size limitation, which means that your Ubuntu install should be around 8GB at most, and you should not include any media files, deb files, etc.
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There is a fork of Remastersys that is still under active development, available here: http://system-imaging.blogspot.co.nz/ – William Lawn Stewart Apr 18 '14 at 09:35