sudo apt-get update
returns some erors :
W: Failed to fetch http:// archive.ubuntu.com/ubuntu/dists/trusty/Release Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file)
W: Failed to fetch http:// archive.ubuntu.com/ubuntu/dists/trusty-security/main/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http:// archive.ubuntu.com/ubuntu/dists/trusty-security/universe/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http:// archive.ubuntu.com/ubuntu/dists/trusty-security/main/binary-i386/Packages Hash Sum mismatch
W: Failed to fetch http:// archive.ubuntu.com/ubuntu/dists/trusty-security/main/i18n/Translation-en Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
it seems to happen with the ubuntu official repo. Any idea why ?
For information, my sources.list is the following :
#----------------------------------------------------------#
# OFFICIAL UBUNTU REPO #
#----------------------------------------------------------#
###### Ubuntu Main Repos
deb http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse
###### Ubuntu Update Repos
deb http://archive.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
###### Ubuntu Partner Repo
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
###### Ubuntu Extras Repo
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
#------------------------------------------------------------------------------#
# UNOFFICIAL UBUNTU REPOS #
#------------------------------------------------------------------------------#
###### 3rd Party Binary Repos
#### MongoDB - http://www.mongodb.org/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen
Best Answer
The problem may comes from your /etc/resolv.conf file, check if you have some
nameserverdirectives on it and try to ping archive.ubuntu.comHere is my resolv.conf :
I use Google's public dns (https://developers.google.com/speed/public-dns/)
Then try apt-get update