dpkg: regarding B_2.0.5_all.deb containing B:
 B breaks A
  A (version 0.4.6) is present and installed.

dpkg: error processing archive B_2.0.5_all.deb (--install):
 installing B would break A, and
 deconfiguration is not permitted (--auto-deconfigure might help)
Errors were encountered while processing:
 B_2.0.5_all.deb