How to install submin on nginx server

Hi I want to install a submin package in my ubuntu 14 droplet.

But i’m getting this error:

root@miargin:/etc/apt# sudo apt-get install submin2                                                                                                                
Reading package lists... Done                                                                                                                                      
Building dependency tree                                                                                                                                           
Reading state information... Done                                                                                                                                  
Some packages could not be installed. This may mean that you have                                                                                                  
requested an impossible situation or if you are using the unstable                                                                                                 
distribution that some required packages have not yet been created                                                                                                 
or been moved out of Incoming.                                                                                                                                     
The following information may help to resolve the situation:                                                                                                       
                                                                                                                                                                   
The following packages have unmet dependencies:                                                                                                                    
 submin2 : Depends: submin2-full but it is not going to be installed                                                                                               
E: Unable to correct problems, you have held broken packages.                                                                                                      
root@miargin:/etc/apt# sudo apt-get install submin                                                                                                                 
Reading package lists... Done                                                                                                                                      
Building dependency tree                                                                                                                                           
Reading state information... Done                                                                                                                                  
E: Unable to locate package submin                                                                                                                                 
root@miargin:/etc/apt# cd /sources.listsd  

Anyone can help me?