Ubuntu
update-manager package

  1. Bug #24061
  2. Comment #81

Comment 81 for bug 24061

Revision history for this message
John A Meinel (jameinel) wrote :

FWIW, I do see this occasionally, but I'm guessing my ISP is doing transparent proxy caching. However,
 sudo apt-get update -o Acquire::http::No-Cache=true
Did fix it for me.