how to set 16:9 in virtualbox

  • user warning: Can't open file: 'sessions.MYI'. (errno: 145) query: SELECT COUNT(sid) AS count FROM sessions WHERE timestamp >= 1511060604 AND uid = 0 in /var/www/drupal-5.23/includes/database.mysql.inc on line 174.
  • user warning: Can't open file: 'sessions.MYI'. (errno: 145) query: SELECT DISTINCT u.uid, u.name, s.timestamp FROM users u INNER JOIN sessions s ON u.uid = s.uid WHERE s.timestamp >= 1511060604 AND s.uid > 0 ORDER BY s.timestamp DESC in /var/www/drupal-5.23/includes/database.mysql.inc on line 174.

I have install debian in virtualbox. Howwever, it is 4:3. How to set to 16:9 full screen? I have the VBoxLinuxAdditions. I have successfully set the resolution in Ubuntu and SUSE but failed in Debian?
Thank you.