Thanks for reporting this bug. Unfortunately I cannot reproduce this. Could you please attach the file
/var/log/apt/term.log
which will hopefully have more information.
Also, please tell us how you initiated the upgrade. I'd recommend trying
sudo apt-get update && sudo apt-get -y dist-upgrade && sudo do-release-upgrade
and seeing whether that succeeds.
Thanks for reporting this bug. Unfortunately I cannot reproduce this. Could you please attach the file
/var/log/ apt/term. log
which will hopefully have more information.
Also, please tell us how you initiated the upgrade. I'd recommend trying
sudo apt-get update && sudo apt-get -y dist-upgrade && sudo do-release-upgrade
and seeing whether that succeeds.