Comment 1 for bug 1470072

  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/util.py", line 211, in find_changelog
    raise UnparseableChangelog(str(e))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xed' in position 103: ordinal not in range(128)

So the changelog around character 103 should give some clue ?