우분투 18.04 업그레이드 실패

parkon의 이미지

우분투 16.04에서 18.04로 업그레이드 하려고 하는데 잘 안되는군요.

https://hiseon.me/2018/05/18/upgrade-ubuntu-18-04/

이 사이트를 보고 따라하는데
sudo do-release-upgrade 명령어를 내리면

...
Fetched 53.6 MB in 6s (6,622 kB/s)                                              
 
Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
 
Calculating the changes
 
Calculating the changes
 
Could not calculate the upgrade 
 
An unresolvable problem occurred while calculating the upgrade. 
 
This was likely caused by: 
* Unofficial software packages not provided by Ubuntu 
Please use the tool 'ppa-purge' from the ppa-purge 
package to remove software from a Launchpad PPA and 
try the upgrade again. 
 
If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 
 
 
Restoring original system state
 
Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

이런 메시지를 보여주면서 실패합니다.

뭔가 써드 파티 프로그램이 문제인것 같은데, 그래서 ppa-purge를 사용해 그 프로그램을 죽이라는 것 같은데
정확히 어떻게 해야할 지를 모르겠네요.

참고로 의심이 드는 것은 nvidia의 cuda를 깐 적이 있고, 인텔 포트란 컴파일러를 깐 적이 있습니다.
 do update 명령어를 치면

Hit:1 <a href="http://download.virtualbox.org/virtualbox/debian" rel="nofollow">http://download.virtualbox.org/virtualbox/debian</a> xenial InRelease
Ign:2 <a href="http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64" rel="nofollow">http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64</a>  InRelease                                                                        
Ign:3 <a href="http://dl.google.com/linux/chrome/deb" rel="nofollow">http://dl.google.com/linux/chrome/deb</a> stable InRelease                                                                                                      
Ign:4 <a href="http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64" rel="nofollow">http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64</a>  InRelease                                                            
Hit:5 <a href="http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64" rel="nofollow">http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64</a>  Release                                                           
Hit:6 <a href="http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64" rel="nofollow">http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64</a>  Release                                                          
Get:7 <a href="https://deb.nodesource.com/node_8.x" rel="nofollow">https://deb.nodesource.com/node_8.x</a> xenial InRelease [4,646 B]                                                                                          
Hit:10 <a href="http://dl.google.com/linux/chrome/deb" rel="nofollow">http://dl.google.com/linux/chrome/deb</a> stable Release                                                                                                       
Hit:12 <a href="http://archive.ubuntu.com/ubuntu" rel="nofollow">http://archive.ubuntu.com/ubuntu</a> xenial InRelease                                                                                                        
Hit:13 <a href="http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu" rel="nofollow">http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu</a> xenial InRelease                                
Get:14 <a href="http://archive.ubuntu.com/ubuntu" rel="nofollow">http://archive.ubuntu.com/ubuntu</a> xenial-updates InRelease [109 kB]                                                                  
Hit:15 <a href="http://ppa.launchpad.net/webupd8team/atom/ubuntu" rel="nofollow">http://ppa.launchpad.net/webupd8team/atom/ubuntu</a> xenial InRelease                                                                              
Get:16 <a href="http://archive.ubuntu.com/ubuntu" rel="nofollow">http://archive.ubuntu.com/ubuntu</a> xenial-backports InRelease [107 kB]                                               
Get:17 <a href="http://archive.ubuntu.com/ubuntu" rel="nofollow">http://archive.ubuntu.com/ubuntu</a> xenial-security InRelease [109 kB]               
Hit:18 <a href="http://archive.canonical.com/ubuntu" rel="nofollow">http://archive.canonical.com/ubuntu</a> xenial InRelease              
Fetched 330 kB in 3s (93.2 kB/s)                        
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

이렇게 나오고요.

힌트나 조언 주시면 감사하겠습니다.