After I upgrade to Ubuntu 10.10 Maverick, Alt+PrintScreen key combination to take a screenshot of current window is not working. Actually, it is because Alt+PrtScn is in conflict with Magic SysRq key.
To make Alt+PrtScn work again in Ubuntu 10.10 you should disable Magic SysRq key with this command in terminal:
sudo sysctl -w kernel.sysrq=0
If the setting disappears after reboot, just add following into the file : /etc/sysctl.conf
kernel.sysrq = 0
To enable Magic SysRq key, use:
sysctl -w kernel.sysrq=1
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