C:

> I want to fill a ubyte array with random data.

In D ubytes are not char, they are two different types. So if you want ubytes, 
then use ubytes:
uniform!("[]")(ubyte.min, ubyte.max)


Regarding your error, a reduced test case:

import std.random: uniform;
void main() {
    uniform!("[]")(char.min, char.max);
    uniform!("(]")(char.min, char.max);
}

Bye,
bearophile

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