How to upgrade from 18.04 to 20.04? [duplicate]

Is this the best way to get 18.04.6 upgraded to 20.04?

I get these messages when I attempt to upgrade:

$ sudo do-release-upgrade -c
Checking for a new Ubuntu release
Failed to connect to Check your Internet connection or proxy settings
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release set Prompt=normal in /etc/update-manager/release-upgrades. 

Why is it telling me there is no development version available? I want a production LTS version, no interest in a development version. I am able to ping so not sure what it's saying about internet proxy settings.

1 Answer

try this -

sudo do-release-upgrade -h

for more details browse -