I had upgraded to Kubuntu 8.04 from 7.10 on my laptop LG LW40 and
started experiencing very strange system freezes. First times I was
unable to understand what is causing such freezes and each time I was
doing different things on my laptop.

But later I found the way how to reproduce freeze 100%.

1.    I open some URL in Firefox (tried 2.x and 3.x versions).
2.1. Copy some text on the screen by selecting it with mouse and simultaneously 
press few keyboard buttons. It is enough to repeat these two actions 
chaotically couple of times to get system freeze.
2.2. Also freeze is reproduced if I press Ctrl+F in Firefox (search toolbar) 
when having some text selected and start typing in the search field.

Actually freezes randomly (but less frequently) occur when I do not even
have Firefox running, but I pointed out the Firefox just because in this
way I am reproducing the hangs in 100% of cases.

In the above way the hangs are repeated when running on live CD with
Ubuntu 8.04. And before the upgrade I have never faced such problems. So
I think this is something wrong in our new Kubuntu.

Interestingly, but in my case disabling the wireless card does no help
out. In the above way my laptop freezes regardless of using the WiFi
card or not.


To S.R.Parda:
Could you please check out the above steps and let know does it freeze in that 
way?

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Ubuntu 8.04 Freezes 
https://bugs.launchpad.net/bugs/228633
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