Bug#561289:

[Гузанов Даниил <melkor217@gmail.com>]

dan@dan-desktop:~/linux$ cat /etc/kernel/postinst.d/initramfs-tools
#!/bin/sh

# passing the kernel version is required
[ -z "$1" ] && exit 0

# kernel-package passes an extra arg; hack to not run under kernel-package
[ -z "$2" ] || exit 0

# we're good - create initramfs.  update runs do_bootloader
update-initramfs -c -t -k "$1"

dan@dan-desktop:~/linux$ cat /etc/kernel/postrm.d/initramfs-tools
#!/bin/sh

# passing the kernel version is required
[ -z "$1" ] && exit 0

# kernel-package passes an extra arg; hack to not run under kernel-package
#[ -z "$2" ] || exit 0

# delete initramfs
update-initramfs -d -k "$1"

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Why do you use so strange hack? Kernel-package works with initramfs-tools perfectly.