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I have installed ubuntu 12.04 inside windows 7, and love to try it,but I don't know why it slows down and windows become grey while installing updates or using software center and that causes "un disfonctionnement total" of all system can I find how to ride over this?

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What are the specs of your pc?! – user61928 Sep 24 '12 at 14:16

If a window becomes gray, it means that it is busy.

You have some options to "fix" this:

  1. You can try to play around with nice levels: sudo snice 19 software-center while starting the update.
  2. Add more RAM to your system.
  3. Migrate to SSD.
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The software center and update manager both are pretty ressource-heavy applications. Depending on your system you might want to consider using command-line tools as a replacement.

To install software:

sudo apt-get install packagename

To update your system (in this order):

sudo apt-get update

sudo apt-get upgrade

For .deb files you can use gdebi as an alternative to the Ubuntu Software Center:

sudo apt-get install gdebi
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