Can't copy using ctrl+c

[tarcisiooliveira]

I'm using SE on Debian Linux and when i try do copy some text using ctrl+c i have the paste comand, when i try to crop using ctrl x i have the copy command, when i try undo using ctrl z i get the crop command. I just can undo comand going to Edit -> Undo.
Others comand like Open(ctrl o), Save (ctrl+s), Find(ctrl + f) in different lines on keyboar are OK.
Othres commands on line "zxcv" keyboard appears to have the same problem.
I`m using ptbr keyboard but i tryed with "us" layout too and the problem persist.
SE version is 3.6.1 but i found the bug since 3.5.

Thanks.

[tarcisiooliveira]

Now i get an error and then opened a pop up. One time can continue using the app in other time the error contiued showing and crash the program.
p.s. i tried copy the text.

[tarcisiooliveira]

There's a similar issue in mono. Maybe this one can be closed.