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I have installed some Ubuntu on my LVM disks. In Ubuntu10.04, I rename the Ubuntu12.04's lv but the "linux-boot-probe" goes wrong.

Here is what I did:

sudo lvname LVMDisk Ubuntu12.04 LabUbuntu12.04 #I have installed Ubuntu12.04 on this lv
sudo linux-boot-prober /dev/mapper/LVMDisk-LabUbuntu12.04 

The following is the result. We still can see root=/dev/mapper/LVMDisk-Ubuntu12.04.

It doesn't change? Why?

/dev/mapper/LVMDisk-LabUbuntu12.04:/dev/mapper/LVMDisk-LabUbuntu12.04:Ubuntu, with Linux 3.2.0-30-generic-pae:/boot/vmlinuz-3.2.0-30-generic-pae:/boot/initrd.img-3.2.0-30-generic-pae:root=/dev/mapper/LVMDisk-Ubuntu12.04 ro quiet splash $vt_handoff
/dev/mapper/LVMDisk-LabUbuntu12.04:/dev/mapper/LVMDisk-LabUbuntu12.04:Ubuntu, with Linux 3.2.0-30-generic-pae (recovery mode):/boot/vmlinuz-3.2.0-30-generic-pae:/boot/initrd.img-3.2.0-30-generic-pae:root=/dev/mapper/LVMDisk-Ubuntu12.04 ro recovery nomodeset
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I found the answer for my own question. The command read the boot/grub/grub.cfg or boot/grub/menu.lst on the device to look for the information.

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  • and you get details of what it did in /var/log/syslog, afaik. – sylvainulg May 20 '15 at 9:57
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    it will read /etc/fstab on the target partition to know whether /boot is mounted from another location, too. That may raise issues when trying to update a system with multiple OS all mounting the same /boot. – sylvainulg May 20 '15 at 10:11

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