Booting with kernel 2.6.12-19-686 throws error regarding /dev/mapper/Ubuntu-root not existing and stops booting

[Carthik Sharma]

I dist-upgrade to dapper from Breezy.

Upon rebooting into the 2.6.15-19-686 kernel, the boot process stopped at loading the /root/ directory and dropped me into a BusyBox terminal prompt.

The error message was "ALERT! /dev/mapper/Ubuntu-root does not exist. Dropping to a shell!"

I later tried booting into the older 2.6.12-10-686 kernel, and there were errors on bootup regarding hotplug.

So essentially, I have a computer without hotplug now, where I had a computer (laptop) with everything before the dist-upgrade.

Please let me know if I can provide additional information. Any clues as to how to get the information would be much appreciated!

[Carthik Sharma (carthik)]

Correction: I didst-upgraded from Breezy to Dapper.

Upon doing this again, just to get the exact error message, I get:

Uncompressing Linux... Ok, booting the kernel.
     Unable to find volume group "Ubuntu"
ALERT! /dev/mapper/Ubuntu-root does not exist. Dropping to a shell!

Busybox v1.01 (Debian 1:1.01-4ubuntu3) Built-in shell (ash)... etc

I have /boot on a seperate partition. I use ext3 for all the partitions. The /home and / are on LVM partitions.

The /boot/ directory has more than 201MB of free space on it.

The laptop is an Acer Travelmate 290 LMi, which used to work wonderfully under Breezy.

[Carthik Sharma (carthik)]

This is the grub menu.lst from the affected laptop

[Carthik Sharma (carthik)]

This is the /etc/fstab file from the affected computer

[Carthik Sharma (carthik)]

This bug has been fixed for me in kernel 2.6.12-20-686.

Thanks.

[James Berry (jibberish)]

I have the same problem with kernel 2.6.15-21-amd64-generic, whereas the previous kernel 2.6.15-20-amd64-generic boots.

Booting the kernel.
    Unable to find volume group "Ubuntu"
ALERT! /dev/mapper/Ubuntu-root does not exist. Dropping to a shell!

I booted using the previous kernel, and checked the version of initramfs-tools 0.40ubuntu29.

Please let me know if you require additional information.

[James Berry (jibberish)]

OK, I found the matching description under Known Bugs and Caveats on the Dapper Beta Page at http://www.ubuntu.com/testing/dapperbeta

I'll try the instructions there (I hadn't seen it as I had starting using Dapper a long time ago...)

[zealubuntu (zealubuntu)]

I got the similar thing here.
I use a T43 laptop.
I dist-upgrade from breezy to dapper today. After a reboot, the startup stops at "loading the /root/ directory", then I did not see any other messages, my gdm started, and I can login, it seems strange. For example, the ipw2200 module is not loaded, and I can not get my wireless network card work.

 2.6.12-9-386