Thank you for taking the time to report this issue and helping to make
Ubuntu better.
Ubuntu 18.04 LTS has two tested & supported upgrade paths.
(1) Firstly to the next release, ie. Ubuntu 18.10. Closed now because 18.10 is
EOL
(2) Secondly to the next LTS release, once 20.04.1 has been released; (likely
August 2020) and isn't available yet.
The error message you obtained also says
"* Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade again."
which is your reason it appears. I picked a package listed in the
VarLogDistupgradeAptLog and explore on packages.ubuntu.com, and you have
a package that isn't from a Ubuntu source (bluez from PPA; a 3rd party
source). The error message I believe is exact, as you haven't removed
3rd party PPA & unofficial sources in your attempt to release-upgrade on
your chosen untested & unsupported path.
I've marked this incomplete, as you haven't followed the instructions of
the error message; or remove all 3rd party software before upgrade to
proceed.
Also for best results I suggest sticking to tested & supported upgrade
paths. If you believe I'm in error, you can return status to 'New'
after leaving a message explaining why, or what I've missed.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1868625
Title:
can't upgrade from 18.04 to 19.10
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