Debian 9 Stretch
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KDE Desktop Environment
Desktop Environment is not neccessary for Server usage, though. But Sometimes installer or using an application requires Desktop Environment, then Install Desktop Environment like follwos.
[1] Install KDE Desktop Environment.
# check boxes like follows

[2] After restarting, login prompt is shown like follows, click the icon which is right side of the username and select [Plasma] and then login as a user.
[3] KDE Desktop Environment starts like follows.
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