Would it be possible to install Ubuntu 12.04 LTS to a flash drive, install all the updates and desired apps such as flash and THEN install it updates and all to another system? I'm hoping I can save a lot of time and repetition by doing it all once on the flash and then maybe applying a few tweaks after I install it on an actual machine.
Using remastersys :
You can create live iso of your existing system. So install all the required packages on your Ubuntu and then take a iso using remastersys. Then using startup disk, you can create bootable usb from this iso.
Then run the following command:
To run the remastersys in GUI mode, type the following command: