problem in upgrading 16.04 to 18.04

when i try this command for upgrade

~$ sudo do-release-upgrade -d 

i get this results and cannot get my system upgraded.. any reason behind this??
i could show the full result as i have less reputations

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1,258 kB]                                                  
Fetched 1,258 kB in 0s (0 B/s)                                                 
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Ign http://dl.google.com/linux/chrome/deb stable InRelease                     
Hit http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial InRelease            
Hit http://dl.google.com/linux/chrome/deb stable Release                       
Hit http://security.ubuntu.com/ubuntu xenial-security InRelease                
Hit http://bd.archive.ubuntu.com/ubuntu xenial InRelease                       
Hit http://ppa.launchpad.net/embrosyn/cinnamon/ubuntu xenial InRelease         
Hit http://bd.archive.ubuntu.com/ubuntu xenial-updates InRelease               
Get:1 http://bd.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]  

Fetched 125 kB in 0s (0 B/s)                                                   
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done