Click on settings
In the Advanced
tab, you can choose to allow clipboard sharing between host and VM
I believe the host is your MAC and the guest is ubuntu, i'm choosing
Host to guest
">
In the Systems
tab you can change the base memory. Also here is the Boot Order
just use default for now
In the Processor
, choose 2 if you did not intially
In the Display
tab, put Video Memory
full, and enable Enable 3D Acceleration