header_postinst.d/nvidia-common gives output to stderr

Binary package hint: nvidia-common

if you are on a system where nvidia-detector will fail, you'll see errors to stderr during apt-get upgrade like:
Setting up linux-headers-2.6.38-8-generic (2.6.38-8.42) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/nvidia-common 2.6.38-8-generic /boot/vmlinuz-2.6.38-8-generic
/etc/kernel/header_postinst.d/nvidia-common: line 8: [: none: unary operator expected

See in /etc/kernel/header_postinst.d/nvidia-common:
if [ -x /usr/bin/nvidia-detector ]; then
    LATEST=$(nvidia-detector)
    if [ ${LATEST} ] && [ "${LATEST}" != "none" ]; then
        db_fset nvidia-common/obsolete-driver seen false
        db_subst nvidia-common/obsolete-driver latest $LATEST
        db_input high nvidia-common/obsolete-driver || true
        db_go || true
    fi
fi

The error comes when nvidia-detector outputs nothing. The line should probably be:
    if [ -n "${LATEST}" ] && [ "${LATEST}" != "none" ]; then

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: nvidia-common 0.2.30
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Tue Apr 12 17:29:41 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nvidia-common
UpgradeStatus: Upgraded to natty on 2010-11-15 (148 days ago)