just updated from 11.04 to 12.04, fresh install installed apt-cacher-ng and notice something strange about it its always downloading index file (Packages.gz) even though the file exist on the apt-cacher-ng's cache, so this is what exactly happened : on ubuntu 10.10 & 11.04 apt-cacher-ng installed & configured on my laptop, then i reload & install some packages after that i configure my friend's laptop with apt-cacher-ng proxy (192.168.1.1:3142), reloading repository was blazingly fast, finished in a second without using my Internet connection (checked on system monitor, total Received just 15kB) on ubuntu 11.10 & 12.04 apt-cacher-ng installed & configured on my laptop, then i reload & install some packages after that i configure my friend's laptop with apt-cacher-ng proxy (192.168.1.1:3142), reloading repository was really slow!, apt-cacher-ng redownload the index file from internet