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With sudden failure of power supply in the remote machine makes the local machine desktop to a complete dead state, meaning I'm not able to kill the current remote desktop connection that was established from local machine. I believe the connection is no more, but the fullscreen mode prevents me to do any other task.

I used this command :

rdesktop -u USERNAME -P PASSWORD -f

-f forces it to render in fullscreen mode   

Is there any way to invoke GUI taskbar (something which shows the current running processes) if exist in Ubuntu with some combination of keyword.

I used Ctrl+Alt+T to invoke terminal, but it didn't worked.

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Try using Ctrl+Alt+F1 to switch from graphical desktop to virtual terminal. After logging in there, you will be able to enter commands.

You may try killing the rdesktop process from there (or investigating the problem any way you want). To return to X, and use graphical desktop, press Ctrl+Alt+F7.

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