Bug#359613: Fail to create initramfs image during kernel upgrade

[Cesare Leonardi <celeonar@tiscali.it>]

Package: initramfs-tools
Version: 0.59
Severity: serious

Some minutes ago i have run aptitude to update my Debian Sid and the 
installation of the latest kernel has failed with the following messages:

----------------------------------------------------------------
Setting up linux-image-2.6.16-1-686 (2.6.16-3) ...
Running depmod.
Finding valid ramdisk creators.
Using mkinitramfs-kpkg to build the ramdisk.
/usr/sbin/mkinitramfs-kpkg: line 55: supported_host_version: unbound 
variable
mkinitramfs-kpkg failed to create initrd image.
Failed to create initrd image.
dpkg: error processing linux-image-2.6.16-1-686 (--configure):
 subprocess post-installation script returned error exit status 9
dpkg: dependency problems prevent configuration of linux-image-2.6-686:
 linux-image-2.6-686 depends on linux-image-2.6.16-1-686 (= 2.6.16-3); 
however:
  Package linux-image-2.6.16-1-686 is not configured yet.
dpkg: error processing linux-image-2.6-686 (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 linux-image-2.6.16-1-686
 linux-image-2.6-686
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up linux-image-2.6.16-1-686 (2.6.16-3) ...
Running depmod.
Finding valid ramdisk creators.
Using mkinitramfs-kpkg to build the ramdisk.
/usr/sbin/mkinitramfs-kpkg: line 55: supported_host_version: unbound 
variable
mkinitramfs-kpkg failed to create initrd image.
Failed to create initrd image.
dpkg: error processing linux-image-2.6.16-1-686 (--configure):
 subprocess post-installation script returned error exit status 9
dpkg: dependency problems prevent configuration of linux-image-2.6-686:
 linux-image-2.6-686 depends on linux-image-2.6.16-1-686 (= 2.6.16-3); 
however:
  Package linux-image-2.6.16-1-686 is not configured yet.
dpkg: error processing linux-image-2.6-686 (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 linux-image-2.6.16-1-686
 linux-image-2.6-686
Press return to continue.
----------------------------------------------------------------

Since now i need to sleep and i'm using my last energies to write this 
bug report, i haven't rebooted the system yet to avoid surprises, but i 
suspect that when i'll do, it will be unbootable.

Now i'm unsure of the command i have to launch to correctly build 
initramfs, but fortunally i have kept the old 2.6.15-1-686...

Regards.

Cesare.