How to upgrade ubuntu 18.10 to 19.04

Since 18.10 no longer supported you can upgrade manually to 19.04

Steps to upgrade:

1. mkdir /tmp/upgrade
2. cd /tmp/upgrade
3. wget http://old-releases.ubuntu.com/ubuntu/dists/disco-updates/

   main/dist-upgrader-all/current/disco.tar.gz
4. tar -xvf disco.tar.gz
5. sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
6. /etc/apt/sources.list change all links prefix to ->

    http://old-releases.ubuntu.com/
7. sudo python3 dist-upgrade.py or run do-release-upgrade

If you run do-release-upgrade, answer yes to all the questions asked.

Happy upgrading!