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centos kickstart gdm

Starting GDM after a Kickstart installation

When installing CentOS7 from Kickstart, GDM is not starting at boot.
This is because the default target is "multi-user":

ls -l /etc/systemd/system/default.target
lrwxrwxrwx. 1 root root 41 Mar 24 01:53 /etc/systemd/system/default.target -> /usr/lib/systemd/system/multi-user.target

To solve this, I put these lines in the "%post" section:

%post
rm /etc/systemd/system/display-manager.service
rm /etc/systemd/system/default.target
ln -sf /usr/lib/systemd/system/graphical.target /etc/systemd/system/default.target
ln -sf /usr/lib/systemd/system/gdm.service /etc/systemd/system/display-manager.service
%end

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