lengau
1
On my first start of Unity, I got this error:

It’s not a big deal since it was easy to fix with chmod:

But I couldn’t find it in the forum, so I thought I should mention it in case anyone else sees it.
In case anyone else sees this problem, the command to fix it is below
sudo chmod 4755 /opt/Unity/Editor/chrome-sandbox
It may be worth adding that to the postinst script in the deb package as a workaround.
For reference, I’m on Kubuntu 15.04
system
2
When you run platform-agnostic installer it does it for you.
Tak
3
It is part of the deb package - I’m not sure what went wrong with the installation process in your case.
jwinn
4
The same thing happened to me on a fresh install of Ubuntu Mate (+Chrome). Using the deb package.
Yo tuve el mismo problema pero instalándolo manualmente desde Arch Linux