The rookie mistakes installing octave into the ubuntu

The description of problem

The steps for installing

sudo apt-add-repository ppa:octave/stable
sudo apt-get update
sudo apt-get install octave

A solution for addressing the above-mentioned problem.

We could just use the command sudo apt-get clean to fix the problem mentioned above.

Then I just input the command sudo apt-get install octave and get the following results:()

I am sorry to hear that the above command cannot achieve my promising results. The I just find some clues that told me that the above problem is related about the proxy problem. Therefore, I just found this site.

sudo touch /etc/apt/apt.conf.d/proxy.conf

sudo vim /etc/apt/apt.conf.d/proxy.conf

Then just write the following content into the above file created recently.

Acquire {
  HTTP::proxy "http://127.0.0.1:8080";
  HTTPS::proxy "http://127.0.0.1:8080";
}

NOTE that the port needs to be replaced by your proxy port.
The following just show that the octave has been installed into my Ubuntu successfully.