I installed Ubuntu 14.01 in Drive E and windows 10.1(preview version) in Drive C, but at start up windows is boot up automatically , their is no option for choosing the OS. So how can change the OS at boot up time.?????
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1If you installed Ubuntu and then Windows, the Windows bootloader would of overwritten the Ubuntu one, so [this question](http://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows) may help. – Wilf Oct 26 '14 at 17:30