Since the following document states
> but a user can "add" new addresses to the standard loopback interface,
lo, in order to have it considered a valid address on the machine as
well as for custom routing:
https://netplan.io/examples/#configuring-a-loopback-interface
I believe that the
Public bug reported:
In `netplan.io` package (`0.104-0ubuntu2~20.04.1`) on Ubuntu 20.04, I
ran `netplan apply` command to add addresses to `lo` interface. During
the second run of `netplan apply` command, two addresses `127.0.0.1/8`
and `::1/128` disappeared from `lo` interface.
I have confirmed
