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Using Alt+F2, I type:

sudo Terminal

But nothing happens. I am not aware of making any changes and this used to work.

I am using Ubuntu 12.04 LTS 64 bit.

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up vote 3 down vote accepted

Try pressing Ctrl+Alt+T

This should open a terminal session.

If you want to use Alt+F2, the command to open the terminal is gnome-terminal.

You can either use the sudo command for actions that require root or you can use the su and then enter the root password to run the session as root. Alternatively, you can use sudo -i to run a root shell.

If you don't know the root password, use sudo passwd root to change it.

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If you press Ctrl + Alt + T to run Terminal

When you are in Terminal, you type sudo before a command if it requires root privileges.

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