Unblocking apt-get

If you ever encounter a failure with apt-get, perform the operations on a console under root:
Kill the process named apt-get: killall -9 apt-get
Reconfigure dpkg: dpkg --configure -a
Update apt-get: apt-get update
Update packages, including improperly installed: apt-get upgrade

Unblocking the message to be validated

It may be that the failure occurred because a message that was to be validated in console. Simply close the installation process/update without really finish or killing it.

You are still able as root and console:

1.View the details to get the console mode if you are using graphical mode.
2.To select the message to validate, you move with the <Tab> key then press the<Space> key to validate.