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The way I'm installing the DEs:
XFCE:
apt install -y xfce4
KDE:
apt install aptitude tasksel
aptitude install ~t^desktop$ ~t^kde-desktop$
Both seem to prompt for a selection for the language/keyboard halfway through. Is there an option to make it auto-select default and proceed?
Use the noninteractive debconf frontend:
export DEBIAN_FRONTEND=noninteractive
apt install -y xfce4
This will prevent the packages from asking questions, and the defaults will be chosen.
