E: Failed to fetch http://desktop-download.mendeley.com/download/apt/dists/stable/main/binary-amd64/Packages.gz  Writing more data than expected (598 > 597) [IP: 52.85.41.40 80]
   Hashes of expected file:
    - Checksum-FileSize:597 [weak]
    - SHA512:72bb97efccc855a6daaf2b87565192d2f38d10e076dd1e889be7630e960d44a7877ec88fc5a309fdb6ddb73fd6328d4c920d92e1341046abb1d1e4103e549d8d
    - SHA256:b33c00097fe078698a8d7ba4e5d7d63345447c2e6050e700b76404dac0655d66
    - SHA1:a2175e93349e7ccff754f518d2dcb18cb0e1d67f [weak]
    - MD5Sum:e741aa960babba3ff66e0928e598419b [weak]
   Release file created at: Wed, 30 Nov 2016 12:41:17 +0000
E: Some index files failed to download. They have been ignored, or old ones used instead.