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!