Ubuntu-Mate accessibility probably compromised

[Pawel L.]

Hello,
Recently I tried to install Ubuntu-mate desktop 20.04 on my Lenovo M83 
system.
Unfortunately, I was unable to go ahead with anything beyond ORCA 
activation at the installation screen. There was no way to bring the focus 
on any option such as 'try ubuntu' nor 'instal ubuntu'.
I had no such problems with Ubuntu-mate 19.10 installation.
Any tips/suggestion on how to over come this, please?
Thanks,
Pawel