And, of course, make sure you have good backups of all those personal files you can't afford to loose. support TRIM with SSD drives, as do Mac OS X 10.6.8+ and Android 4.3+.

Please obtain an OSX recovery/installation media before going any further. l Recover the deleted files quickly before the user or Windows writes data on.

A solid knowledge of the basics of partitioning is needed and the sequence of questions show that you don't know what you're doing so the risk of ending up with an unbootable system is very high. Now my honest and necessarily harsh opinion: You don't know enough yet for the task you want to perform. And all you should have done was to shrink one or more partitions there to make room for Ubuntu. Partitions are always better managed from the original already installed OS using said OS native tools. I said you can do the same with GParted and you can, right-clicking any partition gives you all the possible actions, but I never said you should. just make sure you aren't deleting the system partition(s). The same way you created them you can also delete, resize, etc. Gparted is as easy as the OSX Disk Utility, the tool that you probably used to create the (unneeded and unusable) partitions in the first place.

How to reset macbook pro os x 10.6.8