Public bug reported:

tested with
 - shutdown from Gnome
 - gnome-session-quit --power-off --force from terminal (with sudo)
 - shutdown -h now from terminal (with sudo)
 - shutdown -P now from terminal (with sudo)
 - poweroff from terminal (with sudo)

result is always the same. session closes, there are messages about
switching off, screen goes black, all disks and fans switch off. the
after 2-5 seconds computer starts again and boots into linux

this doesn't happen with windows 7 (i have dualboot system)

i found some instructions on internet mentioning switching off 'wake on
lan' in bios, but it seems i don't have such option at all

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-23-generic 3.5.0-23.35
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  selmi3     2165 F.... pulseaudio
 /dev/snd/controlC0:  selmi3     2165 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Date: Sun Feb 10 23:18:21 2013
HibernationDevice: RESUME=UUID=cc63da1b-8661-464f-bd6a-0886318c13a3
InstallationDate: Installed on 2013-02-03 (7 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
IwConfig:
 eth0      no wireless extensions.
 
 eth1      no wireless extensions.
 
 lo        no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
MarkForUpload: True
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic 
root=UUID=a041b2f5-45d4-4741-92e5-af5154358862 ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-23-generic N/A
 linux-backports-modules-3.5.0-23-generic  N/A
 linux-firmware                            1.95
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/09/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F10
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H77-D3H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF10:bd08/09/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH77-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug quantal

** Attachment added: "lsb_release-rd.log"
   
https://bugs.launchpad.net/bugs/1121489/+attachment/3523471/+files/lsb_release-rd.log

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https://bugs.launchpad.net/bugs/1121489

Title:
  When computer is ordered to shutdown it switches off and after several
  seconds starts again

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