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I installed Ubuntu 12.04 on an external hard drive and the installation went quit well. I booted into the drive and was able to make all the modifications needed for the external hard drive. I ran into trouble when I booted up the external hard drive on a different machine and then returned back booting up into the original laptop. When booting I get the message that the computer will only operate in low graphics mode. From this point I can only boot back into the OS by the terminal command startx. It is obvious that somehow the drivers from the second machine installed on the external HD thereby creating a conflict for the HD being used again on the first machine. Is there a solution for this? Can Ubuntu on an external drive be adaptable to different machines that it might be used on or shared with? These questions would be relative to all drivers necessary for the operating system to work well (i.e. wireless drivers)

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