[lubuntu] VM (Virtualbox) on MacBookPro8.1 - DisplayError

Hello together,

I,m new to unix systems!

I tried lubuntu in a vm.
Host system is a mac with highsierra 2.7gh quadcore with 16gb ram and 500gb ssd

at the First Boot everything looks good - the system ask my for several settings- everything fine
at the Secend boot i just see stripes after the boot screen.

I my opinion the problem is caused by the graphik driver.
is there a way to update the driver bevore the graphik interface is shown?

Any other solutions?

thanks
Julian