Upgrade Ubuntu Server From 16.04 to 18.04.1

I have received several notifications from my Ubuntu server running in Azure for asking me to upgrade the server to Ubuntu 18.04.1. When Ubuntu 18.04 was first released, I didn’t upgrade the server. I was afraid there could be compatibility issues and I don’t want to break the server. With the release of 18.04.1, it seems the version is stable enough for an upgrade. So I decided to upgrade the server. 

Here is what I did.

First of all, I updated the server with apt update && apt upgrade, and then I backed up my server with Azure VM backup. In case upgrade failed, I can restore the VM back.

Then I ran do-release-upgrade to upgrade the server. The os kernel seemed to upgrade successfully, but the software package upgrade failed with the following output. 

authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'

 libpython3.6-stdlib:amd64
 python3.6
 python3-apt
 python3
 python3-cffi-backend
 apt-xapian-index
 python3-xapian
 python3-gi
 mailutils
 python3-markupsafe
 python3-systemd
 python3-gdbm:amd64
 python3-lib2to3
 python-apt
 dh-python
 python3-distutils
 libpython3-stdlib:amd64
 python3-yaml
 python3-pycurl
 python3-dbus

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.

To continue please press [ENTER]

I did some search on the internet. It seems a common issue. To solve this issue, I ran the command sudo mv /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.bak as it is mentioned here

After the issue was fixed, I just ran sudo apt-get dist-upgrade to upgrade all packages, and I chose to keep all local copies of configurations. After that, the upgrade completed successfully with all software and services running normally.  

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