building and installing a new kernel makes my system unbootable

[Markus Schönhaber]

06.07.2010 15:52, Robert P. J. Day:

> $mount
> /dev/mapper/lynx-root on / type ext4 (rw,errors=remount-ro)
> ... snip ...
> /dev/sda1 on /boot type ext2 (rw)
> ... snip ...
> 
> and, unsurprisingly, the boot-time failure states that the kernel
> can't open root device "mapper/lynx-root" so this tells me that,
> somehow, i haven't built device mapper support into my initrd or
> something like that.
> 
>   does this look familiar to anyone?  what probably trivial step have
> i forgotten to do?  thanks.

I don't know.
I always put my root file-system on LVM and can't remember having had
any problems with that - neither with Ubuntu-provided nor with
self-built kernels.
The system you do update-initramfs on must have lvm2 installed, of
course. Maybe re-installing it helps?

-- 
Regards
  mks