I followed the installation instructions in the website: https://git.skewed.de/count0/graph-tool/-/wikis/installation-instructions for installing graph-tool on Ubuntu 18.04, but when I write "sudo apt-get install python3-graph-tool" in the terminal, it gives me the following error: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: python3-graph-tool : Depends: libboost-context1.67.0 but it is not installable Depends: libboost-iostreams1.67.0 but it is not installable Depends: libboost-python1.67.0 but it is not installable Depends: libboost-python1.67.0-py38 but it is not installable Depends: libboost-regex1.67.0-icu63 but it is not installable Depends: libc6 (>= 2.29) but 2.27-3ubuntu1 is to be installed Depends: libgcc-s1 (>= 3.4) but it is not installable Depends: libgomp1 (>= 9) but 8.4.0-1ubuntu1~18.04 is to be installed Depends: libstdc++6 (>= 9) but 8.4.0-1ubuntu1~18.04 is to be installed E: Unable to correct problems, you have held broken packages. Does anyone know how I can fix it? -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/