I am using Ubuntu since last 5 years but I didn't face such problem
. I am using Kubuntu 10.4 since few days. I am getting too many application crash messages. I have reported bug already but today I'm just updating my software and i got a crash message. and i carelessly close the window without reading the message.
Bingo!!!!
my whole screen get black and menu and windows disappeared but update is still running in terminal. I restart my computer several time but after logging in same black screen. I think everything is working properly but nothing is visible.

Bingo!!!!

my whole screen get black and menu and windows disappeared but update is still running in terminal. I restart my computer several time but after logging in same black screen. I think everything is working properly but nothing is visible.
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