package linux-image-4.2.0-34-generic (not installed) failed to install/upgrade: subprocess new pre-installation script returned error exit status 1

[Jun-Seok Heo]

no.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-34-generic (not installed)
ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
Date: Wed Mar 16 22:11:12 2016
DuplicateSignature: package:linux-image-4.2.0-34-generic:(not installed):subprocess new pre-installation script returned error exit status 1
ErrorMessage: subprocess new pre-installation script returned error exit status 1
InstallationDate: Installed on 2016-03-13 (2 days ago)
InstallationMedia: Lubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.11
SourcePackage: linux-lts-wily
Title: package linux-image-4.2.0-34-generic (not installed) failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel Gullberg (dangu)]

I was sent to this bug report automatically after a fresh install of Lubuntu 14.04 LTS on an old laptop (Sony Vaio VGN-B1XP). It was when the Software Updater was trying to update the kernel that I got this small window popping up asking me to send a bug report. It said something like "this bug has already been reported as seen in the web page".

When running the Software Updater once again and paying close attention to the Details window, I saw this message scrolling by:
"This kernel does not support a non-PAE CPU."

My CPU is one of those having PAE but not reporting it. This means I should have used the option "forcepae -- forcepae" for the install, as stated in many places, for example here: https://wiki.ubuntu.com/Lubuntu/AdvancedMethods
Although I did not use this option when installing Lubuntu. It surprises me that I got this far anyway? My running kernel in Lubuntu right now is (according to uname -r) 4.2.0-27-generic. I don't know if this kernel supports pae, but apparently not as I manage to get up and running after the install?

Anyway: Probably this error can be fixed by using the "forcepae"-option. Does anyone know if I can force this option now, in my currently running system?