How to change the screen resolution of your terminal

Original article: http://superuser.com/questions/598374/how-to-change-the-resolution-of-the-bash-for-a-debian-vm

I'm using Debian inside Virtual Box using a very high resolution on my laptop. Definitively, 25x80 is not very comfortable. One solution is to modify the configuration file of grub as following:

1. Open up /etc/default/grub with superuser privileges: sudo nano /etc/default/grub
2. Uncomment/add the following lines:

   GRUB_GFXMODE=1024x768x32
   GRUB_GFXPAYLOAD_LINUX=keep

3. Save the file and exit: Ctrl-O, Enter, Ctrl-X
4. Run update-grub as superuser: sudo update-grub
5. Reboot, and (hopefully) enjoy a higher-resolution console!