Error: Can't notify admin while restoring backup during a migration to a fresh install

you were right, here is the previous error:

ERROR:  could not create unique index "index_tags_on_lower_name"
DETAIL:  Key (lower(name::text))=(زبا�) is duplicated.
EXCEPTION: psql failed: DETAIL:  Key (lower(name::text))=(زبا�) is duplicated.

which I guess is already reported here: Can't restore due to corrupt indexes (with some clues on how to deal with corrupt indexes) and here There are some duplicated tags I can't merge .

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