我目前有 Ubuntu 19.10 和 gcc 9.1.2
\n\n我想为 CUDA 8 安装以前版本的 gcc（在本例中为 gcc 5）。但我收到此错误：
\n\n(base) \xe2\x9e\x9c ~ sudo apt-get install gcc-5 g++-5 \nReading package lists... Done\nBuilding dependency tree \nReading state information... Done\nPackage g++-5 is not available, but is referred to by another package.\nThis may mean that the package is missing, has been obsoleted, or\nis only available from another source\nHowever the following packages replace it:\n gcc-7-test-results gcc-8-test-results:i386 gcc-7-test-results:i386\n gcc-8-test-results gcc-9-test-results:i386 gcc-9-test-results\n\nPackage gcc-5 is not available, but is referred to by …