I am using VirtualBox-5.1 on Fedora 25. And every time i want to switch tabs in guest os , the vbox is switches with host. Simply any alt+tab , ctrl+alt+down_arrow not working inside Vbox guest os. What should i do?
All key combinations containing CTRL+ALT work by replacing CTRL+ALT with HOST, HOST is the host key of VirtualBox and it is the right CTRL key by default (Your current one should be displayed at the bottom right of your VM window).
ALT+TAB works by simply pressing ALT+TAB while having the guest os window focused, if it doesn't work press HOST to change the focus for ALT key combinations to the guest and vice versa.
Well, I know this is kinda old but it is still occurring, hopefully it will help others.
Maybe this problem is related to an upgrade of the system or some other similar system features change.
In overall, to restore these two (or other more) features, you may do it manually by:
1.switch tabs (actually windows applications) in guest os:
- go to System Settings.
- choose Keyboard.
- in Shortcuts tab, go to the Navigation choice, there, go down to switch applications and click on it then define your shortcut (in your case press Alt+Tab).
You can also configure other shortcuts such as minimizing/maximizing the current window by going (from the 3rd point) into the Windows tab. Where you will find a set of features to configure.