what ppa should be removed to not get apt-get update error

Question

When I try to update I get this error. I am not sure why am I getting this error.

Fetched 424 kB in 46s (9,190 B/s)                                              
W: GPG error: http://download.opensuse.org  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A7D1D38BEB6D886
W: Failed to fetch http://ppa.launchpad.net/alexeftimie/ppa/ubuntu/dists/wily/main/source/Sources  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/alexeftimie/ppa/ubuntu/dists/wily/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/alexeftimie/ppa/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.

Please see this picture and help me to solve this above error

It is not because of wily-backports but because of the PPAs. Look at How can I fix a 404 Error when using a PPA or updating my package lists? to know how to solve this. — Ron, Dec 12 '15 at 04:07
@Ron I have update my question and also added a picture. Please help me to spot error. I can't get it fixed. — abhimanyuaryan, Dec 12 '15 at 05:30
The warnings (the three 404s) are a known bug in the upstream. Apparently the person (alexeftmie) managing the PPAs has been having some problems and his PPAs are unreachable. Try removing the first PPA using ppa-purge. — Ashhar Hasan, Dec 12 '15 at 06:16
Remove all the lines containing opensuse and alexeftimie. Did you even go through the link I posted? — Ron, Dec 12 '15 at 06:29
@Ron i read what you posted but I wasn't removing the ppa's I was just unticking them. Hoping it would fix. Finally it worked, completely removed them — abhimanyuaryan, Dec 12 '15 at 11:23

what ppa should be removed to not get apt-get update error

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