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I am running Windows 8.1. and have just installed a second hard drive on which I have installed Ubuntu. Now when I switch the machine on, it boots to Ubuntu but how can I use the two operating systems interchangeably? In other words, how can I choose an operating system at startup? Can someone please explain to me without being too technical as I am not that literate. Thanks.

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You can try running Boot Repair: help.ubuntu.com/community/Boot-Repair –  Nattgew May 4 '14 at 21:30

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