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What should I do when Ubuntu freezes?

Often my ubuntu freezes up altogether(only able to move my cursor). So i try to reboot using the keys "ALT+PrntScrn+REISUB", but this is what happens >> Once i finish hitting the keys RE, my screen goes BLACK and it shows up a few lines of commands (or whatever) which I dont understand. I have no other choice other than manually force shut down (by pressing power button for 3-4 seconds)

Here is a screenshot of what my black screen displays as soon as I hit R,E

What do these lines mean? Is there anyway I can safely restart my PC?

(Since i was unable to use printscreen, i had to manually take a snap of my monitor using my camera. I had taken 3 pictures of the same screen, because I could not capture the entire text displayed on my screen in a single click)

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marked as duplicate by Jorge Castro, stephenmyall, John S Gruber, Ringtail, Takkat Sep 19 '12 at 10:30

This question was marked as an exact duplicate of an existing question.

difficult to tell if those message are caused by pressing Alt+.. or if that's the cause of your freeze. If the system freezes, can you press Ctrl+Alt+F1 to go to a terminal? – steabert Aug 31 '12 at 18:57
@steabert That looks like a core dump from a kernel panic. If the system responds to Alt-SysRq-E after the freeze then a kernel panic can't be the cause. – cscarney Aug 31 '12 at 20:19
@steabert: No, CTRL+ALT+F1 doesn't work – Jerry-bliss Sep 1 '12 at 7:48
Is there any solution? – Jerry-bliss Sep 10 '12 at 16:20

From the pictures it seems that the ALT-Sysreq-E is killing process 1, the one and only process that should be exempted.

I'd suggest that you skip Alt-Sysreq-E. You may also find that you need to skip Alt-Sysreq-I for the same reason.

Continue on with Alt-Sysreq-S, U, and B. Of the set, Alt-Sysreq-S is the most important prelude, and Alt-Sysreq-B actually forces the reboot.

I've just used Alt-Sysreq-B alone a few times without problems

Please see the question Jorge posted in the comments on what to do to actually pursue the freeze problem.

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