Hello,

Installation is meant to only configure one network, the one needed to
complete the installation. Configuring all other connections should be
done at post install.

Expert mode is actually quite a miss-label. Expert mode is to debug bugs
in the debian-installer itself, for debian-installer developers who are
comfortable breaking and recovering installer when it reaches
incompatible and wrong states. It is not meant to be used on day to day
basis, even if one is an otherwise a computing expert. This mode does
not automatically skip over any questions, and allows one to re-enter
and re-configure things mid-flight, and reach dead-ends in the installer
state machine.

Do not use expert mode for installation. It is a debugging facility /
step-by-step installer execution.

I some obscure situations one may need to preseed certain keys, or
temporarily raise priority of the questions asked, or configure things
from the provided shell. But even in those rare situations, it doesn't
warrant use of the expert mode.

Going back and re-configuring network, means that the first time around
incorrect network settings were provided, and one wishes to re-do the
step. Re-doing a step will wipe old answers, and use the new answers.
This is expected behavior for every step of d-i that is reversible.

So it is correct behavior to strip existing network settings, and
take/apply newly supplied ones. Which is what the user requested the
expert installer to do.

Are two network connections required to complete the installation? Can
the installation complete with just one network connection to an archive
mirror?

Regards,

Dimitri.

** Changed in: debian-installer (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1542389

Title:
  ubuntu-installer drops network connection when trying to configure a
  second network device

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