After installing Ubuntu 14.04(.5), windows keep popping up asking to upgrade to 14.04

[Christopher Barrington-Leigh]

After a fresh install using the latest 14.04 media, which calls itself 14.04.5, a very bad dialog window pops up every few minutes:
It's bad because its title is "14.04.1 LTS Upgrade available", which is very confusing, since I installaed 14.04.5, and it's bad because the content of the information in the dialog has nothing to do with upgrading. See below. Instead, there are option buttons at the bottom, with which I have to decide whether to upgrade now, later, or never. So it appears to be asking me to make an important decision which (a) makes no sense and (b) is not informed by the information in the box.

Here's what's in the window's text area:

Welcome to Ubuntu 14.04 'Trusty Tahr'

The Ubuntu team is proud to announce Ubuntu 14.04 'Trusty Tahr'.

To see what's new in this release, visit:

  http://www.ubuntu.com/desktop/features
Ubuntu is a Linux distribution for your desktop or server, with a fast and easy install, regular releases, a tight selection of excellent applications installed by default, and almost any other software you can imagine available through the network.

We hope you enjoy Ubuntu.

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ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-39-generic 3.13.0-39.66~precise1
ProcVersionSignature: Ubuntu 3.13.0-39.66~precise1-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-39-generic.
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: cpbl 2483 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf2530000 irq 48'
   Mixer name : 'Intel PantherPoint HDMI'
   Components : 'HDA:10ec0269,17aa2203,00100203 HDA:80862806,80860101,00100000'
   Controls : 42
   Simple ctrls : 15
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
   Mixer name : 'ThinkPad EC (unknown)'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined
   Playback channels: Mono
   Mono: Playback [on]
Date: Sat Nov 15 16:49:49 2014
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
MachineType: LENOVO 34372VU
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=92076c43-2780-4000-8d3d-5d7bdbb54643 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 127: pacmd: error while loading shared libraries: libpulsecommon-1.1.so: cannot open shared object file: No such file or directory
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-39-generic N/A
 linux-backports-modules-3.13.0-39-generic N/A
 linux-firmware 1.79.18
SourcePackage: linux-lts-trusty
UpgradeStatus: Upgraded to trusty on 2014-11-15 (0 days ago)
dmi.bios.date: 05/28/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GCET99WW (2.59 )
dmi.board.asset.tag: Not Available
dmi.board.name: 34372VU
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGCET99WW(2.59):bd05/28/2014:svnLENOVO:pn34372VU:pvrThinkPadX230Tablet:rvnLENOVO:rn34372VU:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 34372VU
dmi.product.version: ThinkPad X230 Tablet
dmi.sys.vendor: LENOVO

[Christopher Barrington-Leigh (cpbl)]

By the way, the upgrade dialog/interface is entitled "Upgrading Ubuntu to version 14.04", which is even more disconcerting.