Error during upgrade : Oracle 11g to 12c
The real error is:

ORA-12801: error signaled in parallel query server P000 ORA-01115: IO error reading block from file (block # )
ORA-01115: IO error reading block from file 2 (block # 215616)
ORA-27072: File I/O error
Additional information: 4
Additional information: 215616
Additional information: 212992


The "solutions" you tried make no sense when you get something like this.

Fix the storage/filesystem first.