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How can I fix the following error:

E: Failed to fetch http://ppa.launchpad.net/synapse-core/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
andrew.46
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Mohamed Alhanafy
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1 Answers1

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404 indicates the page or resource is not available. You are probably pointing to a wrong ppa or the ppa has been removed. It is best that you remove the ppa from the sources.

Then run "sudo apt-get update".

Nisheet
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