I came to you with installation problems. Issue appeared today - I used the same process for the last few months and it always worked. (https://developer.couchbase.com/documentation/server/current/sdk/c/start-using-sdk.html)
Get:5 http://packages.couchbase.com/ubuntu xenial/xenial/main amd64 Packages [1449 B] Err:5 http://packages.couchbase.com/ubuntu xenial/xenial/main amd64 Packages Hash Sum mismatch
e[91mE: Failed to fetch http://packages.couchbase.com/ubuntu/dists/xenial/xenial/main/binary-amd64/Packages.gz Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead.
Did you deployed something in the last 24hrs?
Is there any hotfix to make it work?