A simple "apt install ifupdown" will not undo everything that installer
has done to setup the system, nor redo it for the alternative networking
management tool. Where do you expect ifupdown configs to materialize
from? And how do you expect the netplan configs be removed? Given that
the system is sensitive to all configs present on disk. This is similar
situation to how on the desktop one cannot simply "remove network-
manager & install ifupdown" to switch to ifupdown.
"there are plenty of examples" -> can you please give the examples that
you have experienced, specifically? the ubuntu developers have gone
extensive amount of porting, and integration testing to ensure that as
many things as possible are fixed to work, both on new installs and
I really want to know what is still broken and still needs fixing.
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forced use of systemd-networkd interferes with ifupdown in 18.04
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