Sublet dilemma, Both current renters at odds

[Justin S.]

Looking for advice with sublet situation.  One renter (renter1) has moved out for a new job but is still paying rent.  Renter 1 would like to sublet to offset expense.  Renter 1 and renter 2 (renter that still resides at property) are at odds with one another.  

I am assuming it is renter 1 responsibility to find and preliminarily vet sublessor since renter 1 is the one moving out?  

If renter 1 has moved and renter 2 doesn't help facilitate showing of property, is it still renter 1 responsibility to come to city and show property?  Landlords?

Does renter 2 have ability to not 'approve/sign off' on sublessors?  

What about if renter 2 states they feel uncomfortable with living with potential sublessor?

Do both original renters and new sublessor need to sign off with landlord?  What is typically done?

Alot of questions but appreciate anyone that has experience and knows how this is typically handled.

Thanks,