How do I tell boot process to use gentoo partition?

CollieJim · 05-26-2015, 07:29 AM

The scene:
Three weeks ago my computer went to the repair shop. For security and access to my data I kept the hard drive and put it in a cheap laptop. The drive has Gentoo, Mint Linux 17.1, and Ubuntu 14.04.

The cheapie came with Windows 8.1 and UEFI. I removed its drive, disabled UEFI secure boot, and put my hard drive in.

Mint and Ubuntu booted, but Gentoo just gave me a blank screen.
I used Mint, and, during the 3 weeks, updated it. Mistake!

The problem:
Mint has somehow captured the boot process. I cannot get grub2 to use the grub.cfg I create in Gentoo.

I have tried

Code:

grub2-install /dev/sda
grub2-mkconfig -o /boot/grub/grub.cfg

from within Gentoo, but when I reboot I get the Mint configuration missing the kernel just installed. I have to boot Mint and run grub2-mkconfig from there.

How do I get control back with Gentoo?

Thanks

The computer is an HP Pavilion dv6 and the disk has GPT partitioning.

Code:

/ # efibootmgr
BootCurrent: 0003
Timeout: 0 seconds
BootOrder: 3003,3004,2002,2001,2003
Boot0000* Notebook Hard Drive
Boot0001* Internal CD/DVD ROM Drive
Boot0002* Internal CD/DVD ROM Drive (UEFI)
Boot0003* Ubuntu
Boot0004* gentoo
Boot2001* USB Drive (UEFI)
Boot2002* Internal CD/DVD ROM Drive (UEFI)
Boot3003* Internal Hard Disk or Solid State Disk
Boot3004* Internal Hard Disk or Solid State Disk

I tried changing BootCurrent to 0004 but that had no effect.

Head_on_a_Stick · 05-26-2015, 07:44 AM

Run this command from Mint:

Code:

# efibootmgr -o 0004,0003,0002,0001,0000

This should set Gentoo as first in the boot order -- see efibootmgr(8)

EDIT: Sorry, missed the bottom of your edit...

syg00 · 05-26-2015, 07:44 AM

Hmmm - UEFI generally implies gpt. The Linux installers are a little brain-dead in this regard although its been years since I did gentoo. What does "parted -l" show ?.

Head_on_a_Stick · 05-26-2015, 07:46 AM

You could try deleting the "Ubuntu" entry with:

Code:

# efibootmgr -b 0003 -B

syg00 · 05-26-2015, 08:22 AM

Don't edit your post(s), just confuses everybody.
You are trying to update the (protected) MBR; won't work on gpt. See the gentoo wiki.

CollieJim · 05-26-2015, 08:52 AM

Code:

/ # parted -l
Model: ATA WDC WD7500BPVX-0 (scsi)
Disk /dev/sda: 750GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system     Name              Flags
 1      1049kB  200MB   199MB   fat32                             boot, esp
 2      200MB   8393MB  8193MB  linux-swap(v1)
 3      8393MB  49.4GB  41.0GB  ext4
 4      49.4GB  90.3GB  41.0GB  ext4
 5      90.3GB  121GB   30.7GB  ext4
 6      121GB   152GB   30.7GB  ext4
 7      152GB   162GB   10.2GB  ext4
 8      162GB   203GB   41.0GB  ext4
 9      203GB   223GB   20.5GB  ext4
10      223GB   633GB   410GB   ext2
11      633GB   654GB   20.5GB  ext4
12      654GB   664GB   10.2GB  ext2
13      664GB   707GB   42.9GB                  Linux filesystem


Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0
has been opened read-only.
Model: hp BD RW BD-5750H (scsi)
Disk /dev/sr0: 1733MB
Sector size (logical/physical): 2048B/2048B
Partition Table: mac
Disk Flags: 

Number  Start   End     Size    File system  Name   Flags
 1      2048B   6143B   4096B                Apple
 2      1722MB  1724MB  2327kB               EFI

Gentoo is on partition 3, and Mint is on 4.