I have recently installed Ubuntu 13.10 on a external hard disk by using a Windows 8 laptop. I wanted it to be accessible from any other computers. But I found that there were 2 "Ubuntu"s at the boot manager screen even the external hard disk was not connected. Seems it is recognized as dual-boot. Later, I tried to boot it from another computer (Windows 7 desktop). The Ubuntu 13.10 inside cannot be loaded.
I can't find any other solutions, so I post it here. Hoping somebody can help me out. P/S: Both the partition and the swap area are set as Primary Drive.