W: Failed to fetch http://www.bchemnet.com/suldr/dists/debian/extra/binary-amd64/Packages Bad header line
When this error occurs with an otherwise apparently working repository or one that had been working, it pretty much always means some sort of network traffic error occurred. The error should automatically clear quickly, but apt sometimes get stuck in some odd state. Usually clearing the cache takes care of it, but obviously not this time. Some other things you can try to force apt to find the repository again:
1. Change the "http" to "https" in the repository source line. In some cases, it might be necessary to update the repository files, and then revert back to "http" to get it to work.
2. Comment out/deactivate (or delete) the bchemnet repository line, update apt, add the line back and update again.
3. If neither of the above works, it could be a persistent DNS or path resolution problem. (However, I doubt this because if it was you would probably not be able to reach this forum.) If know how, you can try changing the DNS servers being used by your computer/network, updating apt, and then changing the DNS servers back.
4. Wait 24 hours, clear the cache again, and repeat 1 or 2.
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