##Problem description When I launch apt-get update some errors appears:

root@netusg20:~# apt-get update
Hit http://ftp.it.debian.org wheezy Release.gpg
...
Ign http://www.emdebian.org wheezy-grip Release.gpg
Ign http://www.emdebian.org wheezy-grip Release
Err http://www.emdebian.org wheezy-grip/main Sources
  404  Not Found
Err http://www.emdebian.org wheezy-grip/main armel Packages
  404  Not Found
Ign http://www.emdebian.org wheezy-grip/main Translation-en
W: Failed to fetch http://www.emdebian.org/grip/dists/wheezy-grip/main/source/Sources  404  Not Found
W: Failed to fetch http://www.emdebian.org/grip/dists/wheezy-grip/main/binary-armel/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

##Solution Delete the file saved in /etc/apt/sources.list.d Delete the repository url in /etc/apt/sources.list and save this new urls:

deb http://emdebian.bytesatwork.ch/mirror/grip stable-grip main
deb-src http://emdebian.bytesatwork.ch/mirror/grip stable-grip main

Type:

# apt-get update

Then install the package you need or upgrade by typing:

# apt-get upgrade