How to upgrade Ubuntu16.04 to 18.04

Hi @derekzhangv,

When running the following:

sudo apt-get update 
sudo apt-get upgrade -y
sudo apt-get dist-upgrade

Do you see any failed packages on the update?

Additionally, I’ve had a case where a third-party repository with a broken-dependency, which showed up via sudo apt list --upgradable - the package in question did require another package, which was unavailable due to an error of the packager.

I solved it by disabling all third party repositories (as root):

cd /etc/apt/sources.list.d/
for i in *.list; do
  mv $i ${i}.disabled
done

Then cleaned the update state:

apt clean
apt autoclean

and restarted the update process:

do-release-upgrade