Comment 9 for bug 189005

I can confirm it:

~/src/debs$ sudo dpkg -i linux-image-2.6.24-rc8-custom_2.6.24-rc8-custom-10.00.Custom_i386.deb
Selecting previously deselected package linux-image-2.6.24-rc8-custom.
(Reading database ... 138569 files and directories currently installed.)
Unpacking linux-image-2.6.24-rc8-custom (from linux-image-2.6.24-rc8-custom_2.6.24-rc8-custom-10.00.Custom_i386.deb) ...
Done.
Setting up linux-image-2.6.24-rc8-custom (2.6.24-rc8-custom-10.00.Custom) ...
Running depmod.
Finding valid ramdisk creators.
Using mkinitramfs-kpkg to build the ramdisk.
Not updating initrd symbolic links since we are being updated/reinstalled
(2.6.24-rc8-custom-10.00.Custom was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled
(2.6.24-rc8-custom-10.00.Custom was configured last, according to dpkg)
Running postinst hook script update-grub.
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.24.1-custom
Found kernel: /boot/vmlinuz-2.6.24-custom
Found kernel: /boot/vmlinuz-2.6.24-7-generic
Found kernel: /boot/vmlinuz-2.6.24-5-generic
Found kernel: /boot/vmlinuz-2.6.24-rc8-custom
Found kernel: /boot/memtest86+.bin
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
User postinst hook script [update-grub] exited with value 1
dpkg: error processing linux-image-2.6.24-rc8-custom (--install):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 linux-image-2.6.24-rc8-custom
~/src/debs$ fuser -v /var/cache/debconf/config.dat
~/src/debs$