"Meteor 2.11.0 is not installed and could not be downloaded. Please check to make sure that you are online."

I have my meteor project installed on an Ubuntu 16.04 LTS machine.
The current meteor version is 1.10.2 and since I get

" Your app is crashing. Meteor 2.11.0 is available. Update this project with ‘meteor update’"

I am trying to get an update using the below commands since I am connected through VPN (OpenVPN protocol port 443)

export HTTP_PROXY=http://username:password@1.2.3.4:443
export HTTPS_PROXY=http://username:password@1.2.3.4:443
meteor update --release 2.11.0

but still get the below error:

“Sorry, Meteor 2.11.0 is not installed and could not be downloaded. Please check to make sure that you are online.”

can you please assist?