PE firms don’t issue debt for leveraged buyouts. The debt is issued by the target company, ie. Citrix. Citrix is responsible for servicing the debt, not the PE firm.
Isn't this what ultimately took Toys R' Us down? The company actually had huge revenues, but after paying all it debtors could no longer actually make money.
Not that anyone would miss Citrix except for their open source contributions, even if they are pared down.