boost dependencies while installing gt on Ubuntu 18.04

Hello Tiago,

I am trying to install graph-tool on Ubuntu 18.04. I am encountering problems related to boost. What could be done?

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:

python-graph-tool : Depends: libboost-graph1.65.0 but it is not installable

                     Depends: libboost-iostreams1.65.0 but it is not installable

                     Depends: libboost-python1.65.0 but it is not installable

                     Depends: libboost-system1.65.0 but it is not installable

                     Depends: libboost-thread1.65.0 but it is not installable

                     Depends: libboost-regex1.65.0 but it is not installable

                     Depends: libcgal12 but it is not installable

E: Unable to correct problems, you have held broken packages.

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