I just tried again on a fresh install, and noted this in syslog:
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Network configuration changed,
trying to establish connection.
Aug 27 21:55:14 penguin systemd[1]: Starting Load/Save RF Kill Switch Status...
Aug 27 21:55:14 penguin systemd-rfkill[9744]: Failed to open device rfkill0: No
such device
Aug 27 21:55:14 penguin systemd[1]: Started Load/Save RF Kill Switch Status.
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Synchronized to time server
91.189.91.157:123 (ntp.ubuntu.com).
Aug 27 21:55:14 penguin kernel: [24668.459650] iwlwifi :03:00.0: can't
disable ASPM; OS doesn't have ASPM control
Aug 27 21:55:14 penguin kernel: [24668.460729] iwlwifi :03:00.0: loaded
firmware version 18.168.6.1 op_mode iwldvm
Aug 27 21:55:14 penguin kernel: [24668.460758] iwlwifi :03:00.0:
CONFIG_IWLWIFI_DEBUG disabled
Aug 27 21:55:14 penguin kernel: [24668.460760] iwlwifi :03:00.0:
CONFIG_IWLWIFI_DEBUGFS enabled
Aug 27 21:55:14 penguin kernel: [24668.460761] iwlwifi :03:00.0:
CONFIG_IWLWIFI_DEVICE_TRACING enabled
Aug 27 21:55:14 penguin kernel: [24668.460764] iwlwifi :03:00.0: Detected
Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
Aug 27 21:55:14 penguin kernel: [24668.489358] ieee80211 phy1: Selected rate
control algorithm 'iwl-agn-rs'
Aug 27 21:55:14 penguin systemd-udevd[9759]: link_config: autonegotiation is
unset or enabled, the speed and duplex are not writable.
Aug 27 21:55:14 penguin kernel: [24668.492733] iwlwifi :03:00.0 wlp3s0:
renamed from wlan0
Aug 27 21:55:14 penguin systemd-networkd[922]: wlan0: Interface name change
detected, wlan0 has been renamed to wlp3s0.
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Network configuration changed,
trying to establish connection.
Aug 27 21:55:14 penguin networkd-dispatcher[1123]: WARNING:Unknown index 4
seen, reloading interface list
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Synchronized to time server
91.189.91.157:123 (ntp.ubuntu.com).
Aug 27 21:55:17 penguin ModemManager[9578]: Couldn't check support for
device at '/sys/devices/pci:00/:00:1c.1/:03:00.0': not supported by
any plugin
That said, if I manually start NetworkManager afterwards, it appears to inherit
network handling unproblematically without a reboot.
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https://bugs.launchpad.net/bugs/1789130
Title:
netplan apply doesn't activate NetworkManager
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