I had two OS on my PC Windows 7 and Ubuntu in separated partitions. After trying to change windows 7 to windows 8, it works good but Ubuntu has disappeared and the weird thing is that, its partition appeared on my hard drive but I can't switch between them. How can I get Ubuntu back?
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You should install grub again (because windows rewrites you MBR). To do this boot from your ubuntu cd/usb and type in terminal:
sudo mount /dev/sda4 /mnt && sudo grub-install --root-directory=/mnt /dev/sda
In this case sda4 is the linux partition.
Then reboot and grub menu should be there and you will see Ubuntu too.
Nikolay Nikolov
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Just in case.
Boot from your installation media (DVD/USB). Select the 'Try Ubuntu' option, this should run Ubuntu from the DVD/USB then you can open a terminal window & enter the command that Nikolay mentions.
Thumbs up Nikolay, was looking for this myself the other day :D
M. Eldridge
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Please do not use answers as comments. Your answer does not provide a solution for the question. – Eduardo Cola Dec 28 '15 at 12:51
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Don't have enough 'rep' to put it in a comment, otherwise I would have done so – M. Eldridge Dec 28 '15 at 13:11
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Oh! Wow, so this is the answer... :O – AzkerM Dec 28 '15 at 13:49