What Can I Do If Injecting the Key or Password Using Cloud-Init Fails After NetworkManager Is Installed?
A major cause is that the version of Cloud-Init is incompatible with that of NetworkManager. In Debian 9.0 and later versions, NetworkManager is incompatible with Cloud-Init 0.7.9.
Solution
Uninstall the current version of Cloud-Init and install Cloud-Init 0.7.6 or an earlier version.
For details, see Installing Cloud-Init.
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