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					@ -10,7 +10,31 @@ $ cd /etc/apt/sources.list.d | 
				
			
			
		
	
		
			
				
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					$ ls  | 
				
			
			
		
	
		
			
				
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					docker.list  elementary.list  owncloud.list  patches.list | 
				
			
			
		
	
		
			
				
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					so first we need to list the repositories to determine which will be removed: | 
				
			
			
		
	
		
			
				
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					$ sudo apt-key list | 
				
			
			
		
	
		
			
				
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					/etc/apt/trusted.gpg | 
				
			
			
		
	
		
			
				
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					pub   rsa2048 2015-09-28 [SC] [expires: 2022-05-28] | 
				
			
			
		
	
		
			
				
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					      06D7 EADE 708A 40FA 136E  B454 0700 205D FD41 A71A | 
				
			
			
		
	
		
			
				
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					uid           [ unknown] devel OBS Project <devel@s2.owncloud.com> | 
				
			
			
		
	
		
			
				
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					/etc/apt/trusted.gpg.d/elementary.key.asc | 
				
			
			
		
	
		
			
				
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					----------------------------------------- | 
				
			
			
		
	
		
			
				
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					pub   rsa1024 2011-10-01 [SC] | 
				
			
			
		
	
		
			
				
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					      6C87 69CE DC20 F5E6 6C3B  7D37 BF36 996C 4E1F 8A59 | 
				
			
			
		
	
		
			
				
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					uid           [ unknown] Launchpad PPA for elementary OS team | 
				
			
			
		
	
		
			
				
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					``` | 
				
			
			
		
	
		
			
				
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					in this case we will delete the owncloud repository `06D7 EADE 708A 40FA 136E  B454 0700 205D FD41 A71A` by using: | 
				
			
			
		
	
		
			
				
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					``` | 
				
			
			
		
	
		
			
				
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					$ sudo apt-key del "06D7 EADE 708A 40FA 136E  B454 0700 205D FD41 A71A" | 
				
			
			
		
	
		
			
				
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					OK | 
				
			
			
		
	
		
			
				
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					$ sudo apt-get update  | 
				
			
			
		
	
		
			
				
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					``` | 
				
			
			
		
	
		
			
				
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					and you can remove with `rm` commad, in my case I added by error the owncloud repository, thus, I have to remove it: | 
				
			
			
		
	
		
			
				
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