On Monday 28 August 2017 21:34:04 Uwe Brauer wrote:
>    > On Monday 28 August 2017 20:30:49 Uwe Brauer wrote:
>    >
>    > can you type �?
>
> No
>
>    > normally you press "�" once and nothing appears, then if you press a,
>    > it comes out as �.
>
> Yes I know this is what happened before, but not now!
>
>    > try various editors/toolkits....
>
> Did that already
>
>    > test with a new user, you can use kuser for that.
>
> Also done, does not work, very strange.
>
>    > ask in the forum for suse (?),
>
> Ubuntu it should be the forum, but I thought this is a trinity issue?
> For you it works? What is you underlying distribution
>
>
i'm on linux mint 18.2 mate 64bit

try with an other keyboard if you have one
..... try in a VM?