Hi everyone, i’m new here and i’m having some trouble with apt-get update. 
this is the result: 
W:Failed to fetch http://ppa.launchpad.net/tsvetko.tsvetkov/trusty-backports/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/tsvetko.tsvetkov/trusty-backports/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.
how can i fix it? i hope this community can help me, i’ve already tried to find something helpful in the web, but without success. ty so much 
Your source has not been updated to wily, maybe they will update to xenial later.
http://ppa.launchpad.net/tsvetko.tsvetkov/trusty-backports/ubuntu/dists/
But for now you just need to disable it in software sources.
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thanks for the answer! where can i disable it? i use to add sources in /etc/apt/sources.list (when i’m using Debian in my Laptop), writing or deleting a line, here in UMate i don’t know where or how…'cause in /etc/apt/sources.list i cannot find that ppa.
thank you so much
Its in “/sources.list.d”.
The easy way is to pull up software sources from the menu or in terminal…
Code:
software-properties-gtk
And go to the second tab.
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yeeeeeeeeeeeees! solved! ty so much, it was so easy 
that i feel a little bit dumb. thanks a lot man! really appreciate
To me, its surprising how many point and click functions are built into Mate these days.
Enjoy 