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This is a bug in graphics_array, which has been corrected in SageMath 8.9. Please upgrade to the latest stable version of SageMath (9.4).

This is a bug in graphics_array, which has been corrected in SageMath 8.9. Please upgrade to the latest stable version of SageMath (9.4). The binary image of SageMath 9.4 for Ubuntu 18.04 is available at https://www.sagemath.org/download-linux.html.