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Written by Miguel González on 2013-06-17

On fedora wiki about systemd:

... systemd uses symlinks to point to the default runlevel. You have to delete the existing symlink first before creating a new one:

rm /etc/systemd/system/default.target

Switch to runlevel 3 by default:

ln -sf /lib/systemd/system/multi-user.target \
/etc/systemd/system/default.target

Switch to runlevel 5 by default:

ln -sf /lib/systemd/system/graphical.target \
/etc/systemd/system/default.target

...

A link instead a text file... well, it is systemd way.