Latest firmware iwlwifi-6000g2a has a microcode sw error

Loading the firmware /lib/firmware/iwlwifi-6000g2a-6.ucode produces an error message (see attachment).

The previous version loads without errors:

[48673.624785] iwlwifi 0000:03:00.0: Direct firmware load for iwlwifi-6000g2a-6.ucode failed with error -2
[48673.625078] iwlwifi 0000:03:00.0: loaded firmware version 17.168.5.3 build 42301 op_mode iwldvm
[48673.646215] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUG disabled
[48673.646218] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[48673.646219] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[48673.646222] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
[48673.710451] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
[48674.009812] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-firmware 1.169
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Oct 28 03:15:49 2017
Dependencies:

InstallationDate: Installed on 2015-07-31 (819 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: linux-firmware
UpgradeStatus: Upgraded to artful on 2017-10-25 (2 days ago)