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I have win7, win8.1 and Ubuntu installed, each one in a separate partition (win 8.1 is in a separate hard drive). windows 7 and Ubuntu are booted in Grub but not win8. before installing Ubuntu, secure boot was disabled in win8.1 but there was no UEFI firmware settings anywhere in PC setting.

after installing Ubuntu, I tried:

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

sudo apt-get install -y boot-repair && (boot-repair &)

but I get:

E: Unable to locate package boot-repair

since I am a newbie in all theses, kindly write any answers in "for dummies" format!

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Download the boot repair cd, boot from it and just accept the default settings. Thats how i fixed grub in my ubuntu and windows 8.1 setup.

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Please use the following 4 commands:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo sed 's/trusty/saucy/g' -i /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list
sudo apt-get update
sudo apt-get install -y boot-repair && (boot-repair &)

Source: https://help.ubuntu.com/community/Boot-Repair

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