As a workaround for this use case may want to try
sudo systemctl stop NetworkManager.service
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https://bugs.launchpad.net/bugs/1898814
Title:
Under netplan with "renderer: networkd", Up
** Changed in: update-manager (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1898814
Title:
Under netplan with "renderer: networkd", Update-manager claims
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: update-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1898814
Titl