Multiple 64-bit versions (Kubuntu, Lubuntu and Xubuntu) once installed on my ThinkPad R60 show 3GB of RAM, not the correct 4GB of RAM. Last week with 13.04, I had 4GB of RAM (which matches the BIOS) and this week I have 3GB available. Inquiring minds want to know. Details follow:

Linux R60 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux r60

free -m reports:

_             total       used       free     shared    buffers     cached
Mem:          3001        854       2146          0         22        486
-/+ buffers/cache:        346       2655
Swap:            0          0          0

. . . . . .

lshw shows:

description: Notebook
product: 9459AT8 ()
vendor: LENOVO
version: ThinkPad R60/R60i
serial: redacted
width: 64 bits
capabilities: smbios-2.4 dmi-2.4 vsyscall32
configuration: administrator_password=disabled boot=normal chassis=notebook family=ThinkPad R60/R60i frontpanel_password=unknown keyboard_password=disabled power-on_password=disabled uuid=126E4001-48CA-11CB-9D53-B982AE0D1ABB
*-core
description: Motherboard
product: 9459AT8
vendor: LENOVO
physical id: 0
version: Not Available
*-firmware
description: BIOS
vendor: LENOVO
physical id: 0
version: 7CETC1WW (2.11 )
date: 01/09/2007
size: 144KiB
capacity: 1984KiB
capabilities: pci pcmcia pnp upgrade shadowing escd cdboot bootselect socketedrom edd acpi usb biosbootspecification
{snip}
*-memory
description: System Memory
physical id: 29
slot: System board or motherboard
size: 4GiB
*-bank:0
description: SODIMM DDR2 Synchronous
physical id: 0
slot: DIMM 1
size: 2GiB
width: 64 bits
*-bank:1
description: SODIMM DDR2 Synchronous
physical id: 1
slot: DIMM 2
size: 2GiB
width: 64 bits

dpkg -l linux-* returns:

Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Description +++-======================================-=======================================-==========================================================================

un linux-doc-3.2.0 (no description available)

ii linux-firmware 1.79.6 Firmware for Linux kernel drivers

ii linux-generic 3.2.0.52.62 Complete Generic Linux kernel

un linux-headers (no description available)

un linux-headers-3 (no description available)

un linux-headers-3.0 (no description available)

un linux-headers-3.2.0-23 (no description available)

un linux-headers-3.2.0-23-generic (no description available)

ii linux-headers-3.2.0-52 3.2.0-52.78 Header files related to Linux kernel version 3.2.0

ii linux-headers-3.2.0-52-generic 3.2.0-52.78 Linux kernel headers for version 3.2.0 on 64 bit x86 SMP

ii linux-headers-generic 3.2.0.52.62 Generic Linux kernel headers

un linux-image (no description available)

un linux-image-3.0 (no description available)

ii linux-image-3.2.0-52-generic 3.2.0-52.78 Linux kernel image for version 3.2.0 on 64 bit x86 SMP

ii linux-image-generic 3.2.0.52.62 Generic Linux kernel image

un linux-initramfs-tool (no description available)

un linux-kernel-headers (no description available)

un linux-kernel-log-daemon (no description available)

ii linux-libc-dev 3.2.0-52.78 Linux Kernel Headers for development

un linux-restricted-common (no description available)

ii linux-sound-base 1.0.25+dfsg-0ubuntu1.1 base package for ALSA and OSS sound systems

un linux-source-3.2.0 (no description available)

un linux-tools (no description available)