Try adding these two options to the service
Type=oneshot
RemainAfterExit=yes
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Try adding these two options to the service
Type=oneshot
RemainAfterExit=yes
Changing Type=oneshot
and adding RemainAfterExit=yes
underneath does not allow me to boot into my system. I get this as the last terminal message
[ OK ] Reached target Cloud-init target.
No biggie to fix since I did this in a Virtual machine and could restore to an older snapshot.
maybe a second service, that when you log in, the service get enabled, and that service block your first service?