Use of deb in Singular installation

Question

Just switched to ubuntu 14. I tried to install Singular (CA system) without success. Here the owner manual

Step-by-step instructions for Ubuntu 14.04:

• Add gpg key:
  • wget ftp://jim.mathematik.uni-kl.de/repo/extra/gpg
  • apt-key add gpg
• Add deb ftp://jim.mathematik.uni-kl.de/repo/ubuntu14 trusty main to /etc/apt/sources.list

• apt-get update

• apt-get install singular

Here what I did so far:

 ~$ wget ftp://jim.mathematik.uni-kl.de/repo/extra/gpg
 ~$ sudo apt-key add gpg    
 ~$ deb ftp://jim.mathematik.uni-kl.de/repo/ubuntu14 trusty main
  ~> No command 'deb' found...

Any help would be greatly appreciated!

Answer 1

The step-by-step instructions for Ubuntu 14.04 said to open the sources.list file located at /etc/apt/sources.list for editing. You can open the sources.list file for editing in nano text editor using this command:

sudo nano /etc/apt/sources.list  

Add this line to sources.list:

deb ftp://jim.mathematik.uni-kl.de/repo/ubuntu14 trusty main

Press the keyboard combination Ctrl+O and after that press Enter to save the changes in sources.list.

Press the keyboard combination Ctrl+X to exit nano.

Then run these two commands to update the latest list of software and then install singular:

sudo apt-get update
sudo apt-get install singular  

If you get this error when trying to use apt-get:

E: Could not get lock /var/lib/apt/lists/lock - open (11 Resource temporarily unavailable)  

...the instructions for fixing it are at this question:
Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?.

Answer 2

The instructions said to open the sources.list file located at /etc/apt folder and append to it the deb ftp://jim.mathematik.uni-kl.de/repo/ubuntu14 trusty main line.

The easiest procedure is to replace this step with this command that does it for you:

sudo add-apt-repository "deb ftp://jim.mathematik.uni-kl.de/repo/ubuntu14 trusty main"