install failed in ubuntu 16.04, error message is E: Unable to locate package algorand

[past2017]

Subject of the issue

Describe your issue here.

Your environment

• Software version: algod -v
• Node status if applicable: goal node status
• Operating System details.
  ubuntu 16.04
• In many cases log files and cadaver files are also useful to include. Since these files may be large, an Algorand developer may request them later. These files may include public addresses that you're participating with. If that is a concern please be sure to scrub that data.

Steps to reproduce

sudo add-apt-repository "deb https://releases.algorand.com/deb/ stable main"
curl -o /tmp/algorand.pub https://releases.algorand.com/key.pub
sudo apt-key add /tmp/algorand.pub
sudo apt install algorand #only this step report error all other steps run ok

Expected behaviour

Install successfully

Actual behaviour

Error reported as below:

$ sudo apt install algorand
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package algorand