I am using Fedora 21 in Oracle Virtual Box. I am using just tty (no GUI). I need to increase screen resolution, I tried following things but failed:xrandr but gives me error: cannot open displayI also tried typing video=1024x768 as kernel parameter but no successalso tried cvt 1024 768
unable to change screen resolution of tty
linux;virtualbox;console;resolution
Edit /etc/default/grub as:~$ sudo nano /etc/default/grubadd vga=795 to the line GRUB_CMDLINE_LINUX_DEFAULT, it might look like this:GRUB_CMDLINE_LINUX_DEFAULT=splash vga=792then update grub:~$ sudo update-grubnow reboot:~$ sudo reboot -r nowThis method worked for Fedora 21 and Debian 8 in Oracle virtualbox 5