pbuilder create --distribution hoary FAILS on breezy

I get the following error message:

touch: cannot touch `/var/lib/update-notifier/dpkg-run-stamp': No such file or directory
E: Problem executing scripts DPkg::Post-Invoke 'touch /var/lib/update-notifier/dpkg-run-stamp'
E: Sub-process returned an error code
 -> Aborting with an error
 -> unmounting dev/pts filesystem
 ...

I get the following error message:

touch: cannot touch `/var/lib/update-notifier/dpkg-run-stamp': No such file or directory
E: Problem executing scripts DPkg::Post-Invoke 'touch /var/lib/update-notifier/dpkg-run-stamp'
E: Sub-process returned an error code
 -> Aborting with an error
 -> unmounting dev/pts filesystem
 -> unmounting proc filesystem
 -> cleaning the build env
    -> removing directory /var/cache/pbuilder/build//16618 and its subdirectories
rmdir: `/var/cache/pbuilder/build//16618/dev': Device or resource busy
rmdir: `/var/cache/pbuilder/build//16618/.dev': Device or resource busy
rmdir: `/var/cache/pbuilder/build//16618': Directory not empty

I have tried also with:
DEBOOTSTRAPOPTS='--exclude=update-notifier'
And:
DEBOOTSTRAPOPTS[0]='--exclude=update-notifier'

All of them fail with the same error message.

I have to manually unmount the dev and .dev dirs to purge /var/cache/pbuilder and retry.

Could anyone confirm this bug ?