Ask to see him. Or have an appointment.
Thank him for the meeting.
Ask him when I could and couldn't use it (what he told me yesterday).
Ask why I can't use Linux. 
I'm only person using it.
Could they install software for limitations?
Talk about why I want to (becoming a programmer/learning to code).
Better job when I'm older.
Only have weekends to program otherwise.
Say I wouldn't do anything bad.
If all comes to worst ask about virtual machine.