package fglrx 2:8.801-0ubuntu3 failed to install/upgrade: fglrx kernel module failed to build

[Peter T Hayward]

This could be a duplicate but I wasn't shown possible dups.
Using gnome-display-properties on lit external monitor (LG 1280x1024) to set my unlit main monitor (1920x1080 on eDP connection) to new resolution of 1920x1080 (was 1280x1024). Clicked apply and got the error. Looks as though the fglrx package is incompatible with this kernel.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: fglrx 2:8.801-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-7.35-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
Architecture: amd64
Date: Fri Mar 18 10:47:07 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
ErrorMessage: fglrx kernel module failed to build
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110314)
PackageVersion: 2:8.801-0ubuntu3
SourcePackage: fglrx-installer
Title: package fglrx 2:8.801-0ubuntu3 failed to install/upgrade: fglrx kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)
version.compiz: compiz 1:0.9.4-0ubuntu7
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5