libpython3.5 error on Ubuntu17.10

Well, I'll ask again: are you installing on a new clean install of Ubuntu?

Also, the package you're having trouble with is not Python, it's libpython.
Do you have libpython installed? What version? Did you try reinstalling it?

If you don't provide us with detailed information, we can't do much to help
you.

.~´

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Sorry that I didn't provide everything that you asked for. Yes I am installing gt on newly installed Ubuntu17.10 and running `locate libpython`, among other things, gives me:

/var/lib/dpkg/info/libpython3-dev:amd64.list
/var/lib/dpkg/info/libpython3-dev:amd64.md5sums
/var/lib/dpkg/info/libpython3-stdlib:amd64.list
/var/lib/dpkg/info/libpython3-stdlib:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-dev:amd64.list
/var/lib/dpkg/info/libpython3.6-dev:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-minimal:amd64.conffiles
/var/lib/dpkg/info/libpython3.6-minimal:amd64.list
/var/lib/dpkg/info/libpython3.6-minimal:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-minimal:amd64.postinst
/var/lib/dpkg/info/libpython3.6-minimal:amd64.postrm
/var/lib/dpkg/info/libpython3.6-minimal:amd64.prerm
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.list
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.prerm
/var/lib/dpkg/info/libpython3.6:amd64.list
/var/lib/dpkg/info/libpython3.6:amd64.md5sums
/var/lib/dpkg/info/libpython3.6:amd64.shlibs
/var/lib/dpkg/info/libpython3.6:amd64.symbols
/var/lib/dpkg/info/libpython3.6:amd64.triggers

Thus, the version 3.6 seems to be installed and I guess I need 3.5. Is that right?

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