无法将ubuntu从19.10升级到20.04

我无法将ubuntu 19.10升级到20.04 LTS。当我尝试通过终端进行升级时,输出如下:

    salil@salil-latitude-e6430:~$ sudo do-release-upgrade
[sudo] password for salil: 
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]                                         
Get:2 Upgrade tool [1,342 kB]                                                  
Fetched 1,343 kB in 0s (0 B/s)                                                 
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
extracting 'focal.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Hit http://in.archive.ubuntu.com/ubuntu eoan InRelease                         
Hit http://in.archive.ubuntu.com/ubuntu eoan-updates InRelease                 
Hit http://in.archive.ubuntu.com/ubuntu eoan-backports InRelease               
Hit http://security.ubuntu.com/ubuntu eoan-security InRelease                  
Fetched 0 B 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
salil@salil-latitude-e6430:~$ 

有解决这个问题的方法吗?

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