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

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