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Old 05-15-2017, 02:24 AM   #1
sharky
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Can't add linux install to grub menu


Have grub and linux mint installed on /dev/sda. The OS in on /dev/sda1. Have another linux install on /dev/sdb1. I can mount it while booted into mint and I can see the contents of /boot.

Code:
 > ll /media/lfs/boot/
total 6761
drwxrwxrwx 3 mymachine mymachine    2048 Jan 23 11:22 .
drwxrwxrwx 5 mymachine mymachine    2048 Jan 24 03:32 ..
-rw-r--r-- 1 mymachine mymachine  922342 Jan 17 11:47 initrd.gz
drwxrwxrwx 3 mymachine mymachine    4096 Jan 17 10:21 isolinux
-rw-rw-rw- 1 mymachine mymachine 5992432 Jan 15 10:32 vmlinuz
Is there a utility to add the /dev/sdb1 partition to grub.

The grub.cfg file warns not to manually edit and the syntax is very verbose so I'm not comfortable trying to manually add another menu item.
 
Old 05-15-2017, 02:52 AM   #2
syg00
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For Mint update-grub should do it (use sudo). The actual function is provided by os-prober, which has syntax rules for recognising kernels. Whether it'll accept that, you'll only find out by trying.
If not, you'll have to build your own custom entry - see /etc/grub.d/40_custom. Plenty of how-to's online.
 
Old 05-15-2017, 07:06 AM   #3
sharky
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Quote:
Originally Posted by syg00 View Post
For Mint update-grub should do it (use sudo). The actual function is provided by os-prober, which has syntax rules for recognising kernels. Whether it'll accept that, you'll only find out by trying.
If not, you'll have to build your own custom entry - see /etc/grub.d/40_custom. Plenty of how-to's online.
Added this entry to 40_custom.

Code:
menuentry "Linux From Scratch" {
	savedefault
	insmod ext2
	set root='(hd1,1)'
        linux   /vmlinuz root=/dev/sdb1 ro quiet splash 1
}
Ran 'sudo update-grub' and got this returned.

Code:
Generating grub configuration file ...
Found theme: /boot/grub/themes/poly-light-master/theme.txt
Found linux image: /boot/vmlinuz-4.10.0-20-generic
Found initrd image: /boot/initrd.img-4.10.0-20-generic
Found linux image: /boot/vmlinuz-4.4.0-77-generic
Found initrd image: /boot/initrd.img-4.4.0-77-generic
Found linux image: /boot/vmlinuz-4.4.0-75-generic
Found initrd image: /boot/initrd.img-4.4.0-75-generic
Found linux image: /boot/vmlinuz-4.4.0-53-generic
Found initrd image: /boot/initrd.img-4.4.0-53-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
 
Old 05-15-2017, 07:37 AM   #4
sharky
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Actually that did add the custom menu entry and I was able to boot into the other installation.

It promptly kernel panic'd and died on me but that another issue.

This issue is resolved.

Thanks for the help.
 
Old 05-15-2017, 07:43 AM   #5
syg00
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Add your initrd.
 
Old 05-15-2017, 10:48 AM   #6
sharky
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Quote:
Originally Posted by syg00 View Post
Add your initrd.
That was it. Able to boot into the other installation now.

There should be a way to mark a thread as 'DOUBLE SOLVED'.

Forgot to mention that I also had to add /boot before my 'linux' and 'initrd' entries. Final menu entry looks like this.

Code:
menuentry "Linux From Scratch" {
	savedefault
	insmod ext2
	set root='(hd1,1)'
        linux   /boot/vmlinuz root=/dev/sdb1 ro quiet splash 1
        initrd  /boot/initrd.gz
}
 
  


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