You do still owe the money. ————————

Look into a motion to set aside the judgment for failure to lawfully serve the lawsuit.

It depends on the rules of the particular court. Generally it must be filed with the answer or a motion for leave to file is made.

You can try to avoid service but they can use alternate means.

The reference librarians at the local law library may help point you to the right resources or hire an attorney.

There are always defenses. Consult with experienced debt collection defense attorneys in the state where this occurred. Note, You must respond...

No they cannot. If there is a levy, look into a claim of exemption.

You both could be responsible. If he has to pay he can sue you for the amount for which you are responsible.

It depends on what you signed. If you signed that you would be responsible you may have a claim of fraud in the inducement.

The current owner, possibly the trustee or executor, needs to initiate unlawful detainer.