Почему я получаю ошибку BADSIG 13.04 / ошибка ненадежных пакетов в диспетчере программного обеспечения [дубликат]

Я пытаюсь выполнить обновление с помощью sudo apt-get update.

получение ошибки BADSIG.

Get:1 http://us.archive.ubuntu.com raring Release.gpg [933 B]
Hit http://extras.ubuntu.com raring Release.gpg                                
Hit http://security.ubuntu.com raring-security Release.gpg
Get:2 http://us.archive.ubuntu.com raring-updates Release.gpg [933 B]
Hit http://extras.ubuntu.com raring Release                                    
Hit http://security.ubuntu.com raring-security Release                 
Hit http://us.archive.ubuntu.com raring-backports Release.gpg          
Hit http://extras.ubuntu.com raring/main Sources                     
Hit http://us.archive.ubuntu.com raring Release                      
Hit http://security.ubuntu.com raring-security/main Sources                    
Ign http://us.archive.ubuntu.com raring Release                                
Hit http://extras.ubuntu.com raring/main amd64 Packages               
Get:3 http://us.archive.ubuntu.com raring-updates Release [40.8 kB]  
Hit http://security.ubuntu.com raring-security/restricted Sources              
Hit http://extras.ubuntu.com raring/main i386 Packages                         
Hit http://security.ubuntu.com raring-security/universe Sources
Hit http://security.ubuntu.com raring-security/multiverse Sources
Hit http://security.ubuntu.com raring-security/main amd64 Packages             
Hit http://us.archive.ubuntu.com raring-backports Release             
Ign http://us.archive.ubuntu.com raring/main Sources/DiffIndex                 
Hit http://security.ubuntu.com raring-security/restricted amd64 Packages
Ign http://us.archive.ubuntu.com raring/restricted Sources/DiffIndex  
Hit http://security.ubuntu.com raring-security/universe amd64 Packages
Ign http://us.archive.ubuntu.com raring/universe Sources/DiffIndex
Hit http://security.ubuntu.com raring-security/multiverse amd64 Packages
Ign http://us.archive.ubuntu.com raring/multiverse Sources/DiffIndex  
Hit http://security.ubuntu.com raring-security/main i386 Packages     
Ign http://us.archive.ubuntu.com raring/main amd64 Packages/DiffIndex
Hit http://security.ubuntu.com raring-security/restricted i386 Packages
Ign http://us.archive.ubuntu.com raring/restricted amd64 Packages/DiffIndex
Ign http://us.archive.ubuntu.com raring/universe amd64 Packages/DiffIndex
Ign http://extras.ubuntu.com raring/main Translation-en_US
Hit http://security.ubuntu.com raring-security/universe i386 Packages
Ign http://us.archive.ubuntu.com raring/multiverse amd64 Packages/DiffIndex
Ign http://extras.ubuntu.com raring/main Translation-en
Hit http://security.ubuntu.com raring-security/multiverse i386 Packages
Ign http://us.archive.ubuntu.com raring/main i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com raring/restricted i386 Packages/DiffIndex
Hit http://security.ubuntu.com raring-security/main Translation-en
Ign http://us.archive.ubuntu.com raring/universe i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com raring/multiverse i386 Packages/DiffIndex
Hit http://security.ubuntu.com raring-security/multiverse Translation-en
Hit http://us.archive.ubuntu.com raring/main Translation-en
Hit http://security.ubuntu.com raring-security/restricted Translation-en
Hit http://us.archive.ubuntu.com raring/multiverse Translation-en
Hit http://security.ubuntu.com raring-security/universe Translation-en
Hit http://us.archive.ubuntu.com raring/restricted Translation-en
Hit http://us.archive.ubuntu.com raring/universe Translation-en
Get:4 http://us.archive.ubuntu.com raring-updates/main Sources [14.0 kB]
Get:5 http://us.archive.ubuntu.com raring-updates/restricted Sources [14 B]
Get:6 http://us.archive.ubuntu.com raring-updates/universe Sources [9,167 B]
Get:7 http://us.archive.ubuntu.com raring-updates/multiverse Sources [697 B]
Get:8 http://us.archive.ubuntu.com raring-updates/main amd64 Packages [42.5 kB]
Ign http://security.ubuntu.com raring-security/main Translation-en_US
Get:9 http://us.archive.ubuntu.com raring-updates/restricted amd64 Packages [14 B]
Get:10 http://us.archive.ubuntu.com raring-updates/universe amd64 Packages [29.6 kB]
Ign http://security.ubuntu.com raring-security/multiverse Translation-en_US
Ign http://security.ubuntu.com raring-security/restricted Translation-en_US
Ign http://security.ubuntu.com raring-security/universe Translation-en_US
Get:11 http://us.archive.ubuntu.com raring-updates/multiverse amd64 Packages [1,164 B]
Get:12 http://us.archive.ubuntu.com raring-updates/main i386 Packages [42.0 kB]
Get:13 http://us.archive.ubuntu.com raring-updates/restricted i386 Packages [14 B]
Get:14 http://us.archive.ubuntu.com raring-updates/universe i386 Packages [29.9 kB]
Get:15 http://us.archive.ubuntu.com raring-updates/multiverse i386 Packages [1,389 B]
Hit http://us.archive.ubuntu.com raring-updates/main Translation-en            
Hit http://us.archive.ubuntu.com raring-updates/multiverse Translation-en      
Hit http://us.archive.ubuntu.com raring-updates/restricted Translation-en      
Hit http://us.archive.ubuntu.com raring-updates/universe Translation-en        
Hit http://us.archive.ubuntu.com raring-backports/main Sources                 
Hit http://us.archive.ubuntu.com raring-backports/restricted Sources           
Hit http://us.archive.ubuntu.com raring-backports/universe Sources             
Hit http://us.archive.ubuntu.com raring-backports/multiverse Sources           
Hit http://us.archive.ubuntu.com raring-backports/main amd64 Packages          
Hit http://us.archive.ubuntu.com raring-backports/restricted amd64 Packages    
Hit http://us.archive.ubuntu.com raring-backports/universe amd64 Packages      
Hit http://us.archive.ubuntu.com raring-backports/multiverse amd64 Packages    
Hit http://us.archive.ubuntu.com raring-backports/main i386 Packages           
Hit http://us.archive.ubuntu.com raring-backports/restricted i386 Packages     
Hit http://us.archive.ubuntu.com raring-backports/universe i386 Packages       
Hit http://us.archive.ubuntu.com raring-backports/multiverse i386 Packages     
Hit http://us.archive.ubuntu.com raring-backports/main Translation-en          
Hit http://us.archive.ubuntu.com raring-backports/multiverse Translation-en    
Hit http://us.archive.ubuntu.com raring-backports/restricted Translation-en    
Hit http://us.archive.ubuntu.com raring-backports/universe Translation-en      
Hit http://us.archive.ubuntu.com raring/main Sources                           
Hit http://us.archive.ubuntu.com raring/restricted Sources                     
Hit http://us.archive.ubuntu.com raring/universe Sources                       
Hit http://us.archive.ubuntu.com raring/multiverse Sources                     
Hit http://us.archive.ubuntu.com raring/main amd64 Packages                    
Hit http://us.archive.ubuntu.com raring/restricted amd64 Packages              
Hit http://us.archive.ubuntu.com raring/universe amd64 Packages                
Hit http://us.archive.ubuntu.com raring/multiverse amd64 Packages              
Hit http://us.archive.ubuntu.com raring/main i386 Packages                     
Hit http://us.archive.ubuntu.com raring/restricted i386 Packages               
Hit http://us.archive.ubuntu.com raring/universe i386 Packages                 
Hit http://us.archive.ubuntu.com raring/multiverse i386 Packages               
Ign http://us.archive.ubuntu.com raring/main Translation-en_US                 
Ign http://us.archive.ubuntu.com raring/multiverse Translation-en_US           
Ign http://us.archive.ubuntu.com raring/restricted Translation-en_US           
Ign http://us.archive.ubuntu.com raring/universe Translation-en_US             
Ign http://us.archive.ubuntu.com raring-updates/main Translation-en_US         
Ign http://us.archive.ubuntu.com raring-updates/multiverse Translation-en_US   
Ign http://us.archive.ubuntu.com raring-updates/restricted Translation-en_US   
Ign http://us.archive.ubuntu.com raring-updates/universe Translation-en_US     
Ign http://us.archive.ubuntu.com raring-backports/main Translation-en_US       
Ign http://us.archive.ubuntu.com raring-backports/multiverse Translation-en_US 
Ign http://us.archive.ubuntu.com raring-backports/restricted Translation-en_US 
Ign http://us.archive.ubuntu.com raring-backports/universe Translation-en_US   
Fetched 213 kB in 17s (12.4 kB/s)                                              
Reading package lists... Done
W: GPG error: http://us.archive.ubuntu.com raring Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

Как мне это исправить?

Также появляются ошибки при установке ненадежных пакетов в программном центре ubuntu.

«Требуется установка ненадежных пакетов»

   libgconf2-4 libxss1

Это происходит при установке ЛЮБОГО приложения. разные ошибки для каждого приложения.

До сих пор в Ubuntu никогда не возникало этой проблемы. Я почти готов уйти и вернуться к Деб, но мне нравится внешний вид Ubuntu.