Sounds like that you may have a clogged vent pipe. Sometimes birds will make nests in them from the roof.
Or go to ask this oldhouse on utube
Sounds like the main drain for the bathroom may be restricted. As you shower the water doesn't drain away fast enough, and the plumbing begins to fill with water. As the pipes fill, air may be forced out through the toilet trap causing "bubbles". Since the tub is the lowest drain, the water backs up there first.
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