After installing the latest version of Unity3d by command-line in Ubuntu (14.04 of 15), you have this error:

Chromium Embedded Framework requires that the file '/opt/Unity/Editor/chrome-sandbox' is owned by root and hase permission 4755

How do I resolve this problem ?

up vote 4 down vote accepted

You have to add permission to Unity3d sandbox:

sudo chmod 4755 /opt/Unity/Editor/chrome-sandbox

I had the same problem which did not get resolved when I ran the corresponding chmod command. In my case the problem was that my /opt directory is hosted on another NTFS partition and this confused Linux file access privileges.

When I moved back my /opt to the ext4 root partition, Unity3D installed and runs fine.

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