The Alt key solved the problem. But Krita still requires "at least OpenGL 2.0 or ES 2.0". The current installed version seems to be OpenGL 1.4. But I could not figure out how to upgrade it nor install the newer version. Because of the reasons, I mind to download it from their websites. Maybe that is not a so terrible problem, though. I wonder other Trisquel users have not the same problem when they run Krita for the first time.

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