I mistakenly mis-configured Synaptic Package Manager - how do I reset
I was trying to add jessie-backports repository to the existing Synaptic Package manager on my Mint v18 (which I know I did in error) and even though it gave me some error messages, it apparently submitted. When I reran the Synaptic Software Manager, it now gives me the following error message:
E: Malformed entry 2 in list file /etc/apt/sources.list.d/additional-repositories.list (Suite)
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.
Also now when I start the Mint "Software Manager" after authenticating, it "goes away" without any error message or description. I think this condition and the Synaptic Package Manager error are related.
I do I reset my Package Manager to what I had before I made this mistake?
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