Please disable the ubuntu-toolchain-r test PPA using ppa-purge. It
provides packages which are greater than the version to which you are
trying to upgrade.

  Installing libgfortran4 as Depends of liblapack3
    libgfortran4:amd64 Depends on gcc-7-base [ amd64 ] < 7.3.0-21ubuntu1~16.04 
> ( libs ) (= 7.2.0-8ubuntu3.2) can't be satisfied!


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1776790

Title:
  I cannot upgrade to 17.10 from 16.04

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