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I think you're talking about https://github.com/jsliacan/flagmatic. The first instruction there is sage -i csdp, and this fails for me. The only safe way to do this, and in my experience, the only reliable way to be able to build other packages for Sage, is to build Sage from scratch, but fortunately that is not too complicated. Follow the directions at https://doc.sagemath.org/html/en/installation/source.html#sec-installation-from-sources, and in particular at https://doc.sagemath.org/html/en/installation/source.html#debian-ubuntu-prerequisite-installation. (I recommend all four of the sudo apt-get install ... commands given there.)

I think you're talking about https://github.com/jsliacan/flagmatic. The first instruction there is sage -i csdp, and this fails for me. me with Sage installed by apt on Ubuntu. The only safe way to do this, and in my experience, the only reliable way to be able to build other packages for Sage, is to build Sage from scratch, but fortunately that is not too complicated. Follow the directions at https://doc.sagemath.org/html/en/installation/source.html#sec-installation-from-sources, and in particular at https://doc.sagemath.org/html/en/installation/source.html#debian-ubuntu-prerequisite-installation. (I recommend all four of the sudo apt-get install ... commands given there.)