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I'm not able to switch to Seamless Mode in VirtualBox with Ubuntu 10.04 or 9.10 as guest OS's. I have tried the seamless mode with XP as guest OS, and it works absolutely fine. The host OS is Windows 7.

I have in-built Via/S3G Unichrome Pro IGP graphics, and I have allocated 30 MB out of 64 MB of graphics memory. I've also 1.5 GB of RAM.

I also tried installing Guest Additions but it still didn't work. VirtualBox version is 4.0.4r70112. The Host+L does not lead to seamless mode. i.e. under the Machine menu in Virtual box window "Seamless mode" is disabled (comes in grey color). How can I get the seamless mode to work? Please help!

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I have the same problem. In one of my virtual boxes it works, but in the other not. Both have Guest additions installed. – Johan Karlsson Sep 2 '14 at 12:52

For seamless mode (Host+L) Virtual Box Guest Additions of the same program version need to be installed in the guest OS.

How to install Guest Additions see also this answer. In some cases you will simply need to reinstall the Guest Additions if they don't run the way they should.

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Takkat i have installed Virtual box and guest additions of same version. But what problem i have is the Host+L does not lead to seamless mode. – jsbisht Mar 2 '11 at 4:25
If I got you right then you are able to select seamless but you can't move the window of a guest Ubuntu program to the desktop of your host? – Takkat Mar 2 '11 at 8:52
i m not able to select seamless mode. – jsbisht Mar 2 '11 at 17:30
This usually indicates that Guest Additions are not installed. Try again and don't forget to reboot the guest OS to take effect. – Takkat Mar 2 '11 at 17:37
i have tried all that but still the same problem. Anyways thanks. – jsbisht Mar 3 '11 at 10:13

Turn off Nested Paging in the System tab and restart the guest.

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Can confirm that this works. Though it only seems to work with desktops that have panels/taskbars. I can't get dwm, for instance, to work with it. – Braden Best Aug 12 '15 at 4:09

May be you forgot installing the guest additions in the GUEST. For doing so, click in the menu "Devices" in the GUEST window, and choose "install guest additions"

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Install Guest Addtions from Synaptic.

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how to look for guest additions in synaptic. is there a package name for it. – jsbisht Mar 1 '11 at 17:58
Go to Synaptic, after it loads, you'll see a search box in the top right corner. Simply type guest additions there and press Enter. – Oxwivi Mar 1 '11 at 18:14
@jaggib, did you try install Guest Additions from Synaptic yet? – Oxwivi May 31 '11 at 15:55
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. – RolandiXor Sep 28 '12 at 22:00
@RolandTaylor I think the idea here is to install Guest Additions with the guest Ubuntu system's package manager, rather than the (possibly different) version installed through VirtualBox itself (which is what it sounds like the OP did). So, this is an answer to the question. I'm not sure if it's a right answer, but it is an answer. – Eliah Kagan Oct 1 '12 at 19:05

Try by clicking and holding Right Ctrl key and then clicking the L key.

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I'm running windows8.1 guest on ubuntu host and seamlesss mode don't get enabled until user session is started in windows, maybe a few seconds after login.

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I am using an Ubuntu host with a Windows 7 guest. I had the same problem, until I went into the 'Computer' folder on the guest system. If you have loaded the guest additions disc image, it should appear in the CD drive of the guest system. Manually open it, and look for the VBoxWindosAdditions application. Open this and follow the set-up instructions.

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