$ sudo apt-get update                 
Hit:1 https://dl.winehq.org/wine-builds/ubuntu xenial InRelease                
Hit:2 http://archive.ubuntu.com/ubuntu xenial InRelease                        
Hit:3 http://archive.canonical.com/ubuntu xenial InRelease                     
Hit:4 http://ppa.launchpad.net/plushuang-tw/uget-stable/ubuntu xenial InRelease
Hit:5 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease       
Reading package lists... Done                      

E : Failed to fetch https://dl.winehq.org/wine-builds/ubuntu/dists/xenial/InRelease      
Unable to find expected entry 'main/source/Sources' in Release file 
  (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.

2 Answers 2


Try this way :

  1. Alt + F2
  2. enter software-properties-gtk here
  3. in Software & Updates go to Other Software tab
  4. find dl.winehq.org here
  5. uncheck mark near https://dl.winehq.org/wine-builds/ubuntu xenial main (Source Code) (or similar).
  6. Then reload package lists.

Could you post your sources.list? Post the output of

sudo cat /etc/apt/sources.list

How have you added the WineHQ Source?

Have you tried following this: https://wiki.winehq.org/Ubuntu ?

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