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[Pjotr12345 <1431772@xxxxxxxxxxxxxxxxxx>]

Two things I'd try:

1.  install the non-free closed proprietary driver for your video card.
For that, use Software & Updates, tab Additional Drivers;

2. apply a BIOS update (check the support section of the Toshiba website
for that).

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https://bugs.launchpad.net/bugs/1431772

Title:
  Ubuntu 14.04 64-bit edition keeps crashing on Toshiba Laptop

Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  Hello. I installed Ubuntu 14.04.2 64-bit edition on a brand new
  Toshiba c75d-b7215 laptop about 2 days ago. The laptop itself is dual-
  booting with Windows 8.1, and the Windows partition appears to look OK
  (haven't really spent that much time in it, though). I followed the
  Easy Linux Tips guide
  (https://sites.google.com/site/easylinuxtipsproject/) for optimizing
  Ubuntu.

  However, my laptop keeps restarting itself quite randomly. For
  example, I can have about 10 tabs open on Chrome 64-bit edition, and
  LibreOffice open, and then my laptop will restart itself. I don't know
  whether or not this is a hardware issue or a Ubuntu issue. I would
  like to know soon, because I have about 10 days to decide whether or
  not I need to return this laptop and replace it with something else.
  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-31-generic 3.16.0-31.43~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-31.43~14.04.1-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Mar 13 05:45:00 2015
  InstallationDate: Installed on 2015-03-11 (1 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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