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I did the terrible mistake of installing the HWE stack last week. Since then my screen resolution inside VirtualBox has a maximum of 640x480. I downloaded the .iso to install the guest additions (again) but this failed.

What can I do to get the screen resolution working?
The desktop is not usable at all.

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I found the solution myself. It is important to mount the gues additions From the virtual box : mount the CD with guest addition. I previously downloaded the .so from inside Ubuntu this DID not work –  user307578 Jul 21 '14 at 7:29
Please write the answer in the answer box and mark it as solved. –  Parto Jul 21 '14 at 7:32

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