The bsdinstall(8) 'distfetch' command uses an all-or-nothing
success/failure case, derived from DISTRIBUTIONS set in the
environment.

Since the debugging distribution sets will always be remote,
and failure to fetch *-dbg.txz should not prevent the system
from being installed, recommend deselecting the debugging sets
when informing of fetch failures.

In theory, 'bsdinstall distfetch' can iterate through the
selected distributions to fetch them independently, but that
would be a far too intrusive approach for now.

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