Ubuntu – Ubuntu 15.10 is not in Boot Manager

bootdual-bootgrub2partitioning

I have a problem with Ubuntu 15.10
I have in my computer windows 10. Some days ago i decided to install Ubuntu in partition so i can have both in the same hard drive. The problem is that i cant get into ubuntu, i dont have the grub up so i always go to Windows in default mode. The only way to go into ubuntu is with the CD of installation, when im on the grub of the cd i press Esc, then i text exit in command lines and i go to a boot manager in which i can choose the ubuntu system. Its a strange think because it is the only way i can get into ubuntu, i will like to solve this problem. I try many tutorials already of solving this problem. I didnt get any solution so i will like to ask u before doing another tutorial. Thank u

Best Answer

  • It looks like your Ubuntu boot loader (GRUB 2) is not properly registered with the firmware. You should be able to fix it as follows:

    1. Boot the installer in "try before installing" mode.
    2. Open a Terminal window.
    3. Type sudo apt-get install efibootmgr to install the efibootmgr tool.
    4. Type sudo efibootmgr -o 0003,2001,0000,2002,2003. This adds your Ubuntu entry (0003) to the start of the boot order, as shown in lines 589-599 of your Boot Repair output.
    5. Reboot.

    That should fix the problem. Unfortunately, there are some badly broken EFIs that tend to forget their boot orders or ignore anything but Windows boot entries. If you've got such a computer, your best bet is to return it to the store for a refund and get a new computer that's not broken. If that's not possible, Boot Repair has an option on its Advanced menu to back up and rename boot files that might work, but it's an ugly hack of a workaround that might not last all that long, since Windows might easily undo it.