Hello, thanks for your prompt reply. The command you provided worked, but the problem is that any new environment I create on AWS will get deleted every time when I restart the notebook instance. I need to install it in one of the default environments. For example, if I install it in tensorflow_p36 using 'conda install -c conda-forge graph-tool', it stuck at solving environment step forever... (tensorflow_p36) sh-4.2$ conda install -c conda-forge graph-tool Solving environment: - Do you know why it got stuck? I also tried installing it in one of the environments on my linux machine using 'conda install -c conda-forge graph-tool', but got a bunch of package conflicts. Thanks! -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/