[ubuntu] How to increase font size on console etc

Hi all,

Host - Ubuntu 16.04 desktop
Guest - Ubuntu 16.04 server
Oracle VirtualBox

I have spent almost a whole day unable to config Ubuntu 16.04 server after installation.

Problem:-
font size too small on console
mouse not working on console screen

I have runIt couldn't help me out

GuestAddition already installed including virtualbox-guest-dkms

Please help. Thanks

Regards
satimis