[Bug 43149] apt-get update falied for stable version

https://bugs.winehq.org/show_bug.cgi?id=43149

--- Comment #2 from Sebastian Lackner  ---
(In reply to VK Bell from comment #0)
> > sudo apt-add-repository https:/dl.winehq/wine-builds/ubuntu
>
> Then executed following command received the following issues messages and
> update failed.

I am not sure which instructions you are using, but this is not the URL
mentioned on the Wiki (https://wiki.winehq.org/Ubuntu).

It should be: https://dl.winehq.org/wine-builds/ubuntu/
 (In your case the second slash and ".org" part are missing)