Your /etc/apt/sources.list file has the release artful in it while you
seem to have many packages installed from cosmic, Ubuntu 18.10. You'll
need to fix your /etc/apt/sources.list file to reflect the release you
are actually running for the upgrade to Ubuntu 19.04 to be possible.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1827323
Title:
Ubuntu new version 19.04 installation issue
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