virtualbox.org

Just upgraded to Ubuntu 10.04 and the screen size is 800x600 and I cannot make it fit the whole screen.

I have searched through the forum for a solution, and found only what the instruction manual says.

I read that carefully and this part mystifies me:
"Back in the Virtual Media Manager, select that ISO file and press the “Select” button. This will mount the ISO file and present it to your Windows guest as a CD-ROM."

There is no select button, and right clicking does not bring up a menu with that option.

How do I attach the guest additions iso to the virtual machine so that it can then access the extra drivers etc?

TIA
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pqb

In the guest while it is running. Click the devices tab at the top and select install guest additions.
This should help Howto: Install Linux Guest Additions + Xorg config
DO NOT edit or create the xorg.conf. It is not needed in Ubuntu 10.04

Edit: Moving to Linux guests as this better describes your problem

Thanks very much. That allowed me to attach the iso, and after copying the linux additions file to the desktop then running it, it works.
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pqb