Bug#749432: Fixed in new gnome-shell version

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Hi, Pablo.

Your output it's in Spanish, which maybe some people answering to you
can't understand. To get english output in command line, unset LANG
variable, or set it to empty string. For instance, to get english output
from your command:

$ LANG= sudo apt -t experimental install gnome-shell gdm3 gnome-session
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