What about a backport of the fix to 2017.4 (after all it's supposed to be a LTS release and I'd count this as a major bug to be fixed) and 2018.1 as 2018.2 will probably stay in beta for a while?

Same here. I'm using Mac to build Linux64 headless server. The GUI text boxes always register a single keyboard stroke as a double - same with Pasting (ctrl + v) - I get two (2) copies of the string in the text box.

It's not the keyboard repeat settings (i've tried that as well) and it even does in from within a Virtual Box VM (Ubuntu 16.04) with Unity 2017.4.1f1 version running on Mac or Windows > building for Linux.

Hope this is something that Unity can resolve as even delete key deletes 2 chars at a time. - very frustrating bug to say the least.

-Thanks

Same here on the latest 2018 beta, Ubuntu 18.04.

Seems to not affecting Ubuntu 16.04!

I also see this issue still happening with 2018.1.0f2 version on Ubuntu.

Still occurring with Unity 2018.1.0f2

A fix for this in 2017.4 would be extremely welcome.

I just ran into this issue on Unity 2018.1.0b13 (64bit) on Ubuntu 17.10, so I'm not sure if it's been correctly resolved.

Not fixed in 2017.4

I'm not sure if I'm late to the party, but I just wanted to add my two cents:

Characters aren't actually typed twice - the "basic" key is typed before the actual input, so for example, "Hi@Unity" becomes "hHii2@uUnniittyy".

If the issue has been fixed, then I expect the dev who fixed it already noticed this, but I figured I should mention it anyway.

Same issue causing me problems.
Using Unity3D,3,0f2
Build is Linux x64
Linux system is Ubuntu 16.04.1