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have installed two virtual OSs. The host OS is debian. Two virtual OSs are win XP and debian ( without graphical environment) . I have install guest additions too. The win XP one is displayed in fullscreen mode but the debian one isn't. Is it related to it is in text mode ? How can I bring it to fullscreen mode?

I use virtualbox.

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up vote 5 down vote accepted

As your Debian box does not have the GUI installed, I suggest to use SSH to manage the box. Please disregard the virtual display from VirtualBox for daily use as it is way less powerful than using SSH (no copy&paste, less than easy file transfer, etc.) when using a Linux OS as the host.

If you really need to work on a tty on one of the VTs in full screen you could just let it scale up with low quality, use KMS and some kernel boot parameters to set a bigger screen size for which you need VirtualBox 4.2 or up (read here).

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Combine SSH with screen to keep your terminal sessions on the guest open even if you close your local window. – invert Dec 4 '12 at 13:37
My virtualbox is 4.2.0 . So it seems using SSH is the best solution in this case. Thank you. – hd. Dec 5 '12 at 4:25
When going to SSH, it's perphaps a good thing do run VirtualBox headless, then. – Hartmut Apr 3 '14 at 13:10

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