Hi,
There is no direct migration that could be performed, but U need to install fresh RHEL/Ubuntu in parallel with your AIX VM; then install needed middleware/ application SW on top; then migrate / copy your application/workload datas from the source to the target ; test & run that all works fine; then do Final Cut-over / swap from old to new environment and do needed decor/cleanup on old system-
Br,
tommi