Thanks for your bug report.
First of all, you're not using ubuntu-releaser, but apt.
Secondly, the lock message indicates something else is currently
upgrading/installing packages or working the the database (possibly
unattended-upgrades installing security updates), you have to wait for
those to finish (whatever you do, do NOT delete the lock file, that's a
common misconception about how locking works).
** Package changed: ubuntu-release-upgrader (Ubuntu) => apt (Ubuntu)
** Changed in: apt (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1789412
Title:
i can not upgrade to ubuntu 18
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