I am experiencing the same. It must be a problem with the German ubuntu archives. The Swiss archives work without a problem. There must be something, that the Swiss do better? Let's find it out! ;-) # nslookup de.archive.ubuntu.com Server: 127.0.0.1 Address: 127.0.0.1#53 Non-authoritative answer: de.archive.ubuntu.com canonical name = ubuntu.mirror.tudos.de. Name: ubuntu.mirror.tudos.de Address: 141.30.13.10 Name: ubuntu.mirror.tudos.de Address: 141.30.13.20 Name: ubuntu.mirror.tudos.de Address: 141.30.13.30 # cat /etc/apt/sources.list deb http://de.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb-src http://de.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb http://de.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://de.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse # LANG=en_us apt-get update Ign http://de.archive.ubuntu.com trusty InRelease Ign http://security.ubuntu.com trusty-security InRelease Ign http://de.archive.ubuntu.com trusty-updates InRelease Hit http://security.ubuntu.com trusty-security Release.gpg Hit http://de.archive.ubuntu.com trusty Release.gpg Hit http://security.ubuntu.com trusty-security Release Hit http://de.archive.ubuntu.com trusty-updates Release.gpg Hit http://de.archive.ubuntu.com trusty Release Hit http://security.ubuntu.com trusty-security/main Sources Hit http://de.archive.ubuntu.com trusty-updates Release Hit http://security.ubuntu.com trusty-security/restricted Sources Hit http://de.archive.ubuntu.com trusty/main Sources Hit http://security.ubuntu.com trusty-security/universe Sources Hit http://de.archive.ubuntu.com trusty/restricted Sources Hit http://security.ubuntu.com trusty-security/multiverse Sources Hit http://de.archive.ubuntu.com trusty/universe Sources Hit http://security.ubuntu.com trusty-security/main amd64 Packages Hit http://de.archive.ubuntu.com trusty/multiverse Sources Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages Hit http://de.archive.ubuntu.com trusty/main amd64 Packages Hit http://security.ubuntu.com trusty-security/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages Hit http://de.archive.ubuntu.com trusty/restricted amd64 Packages Hit http://security.ubuntu.com trusty-security/main i386 Packages Hit http://de.archive.ubuntu.com trusty/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/restricted i386 Packages Hit http://de.archive.ubuntu.com trusty/multiverse amd64 Packages Hit http://security.ubuntu.com trusty-security/universe i386 Packages Hit http://de.archive.ubuntu.com trusty/main i386 Packages Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages Hit http://de.archive.ubuntu.com trusty/restricted i386 Packages Hit http://security.ubuntu.com trusty-security/main Translation-en Hit http://de.archive.ubuntu.com trusty/universe i386 Packages Hit http://security.ubuntu.com trusty-security/multiverse Translation-en Hit http://de.archive.ubuntu.com trusty/multiverse i386 Packages Hit http://security.ubuntu.com trusty-security/restricted Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Hit http://de.archive.ubuntu.com trusty/main Translation-en Hit http://de.archive.ubuntu.com trusty/main Translation-de Hit http://de.archive.ubuntu.com trusty/multiverse Translation-en Hit http://de.archive.ubuntu.com trusty/multiverse Translation-de Hit http://de.archive.ubuntu.com trusty/restricted Translation-en Hit http://de.archive.ubuntu.com trusty/restricted Translation-de Hit http://de.archive.ubuntu.com trusty/universe Translation-en Hit http://de.archive.ubuntu.com trusty/universe Translation-de Hit http://de.archive.ubuntu.com trusty-updates/restricted Sources Hit http://de.archive.ubuntu.com trusty-updates/universe Sources Hit http://de.archive.ubuntu.com trusty-updates/multiverse Sources Hit http://de.archive.ubuntu.com trusty-updates/main amd64 Packages Hit http://de.archive.ubuntu.com trusty-updates/restricted amd64 Packages Hit http://de.archive.ubuntu.com trusty-updates/universe amd64 Packages Hit http://de.archive.ubuntu.com trusty-updates/multiverse amd64 Packages Hit http://de.archive.ubuntu.com trusty-updates/main i386 Packages Hit http://de.archive.ubuntu.com trusty-updates/restricted i386 Packages Hit http://de.archive.ubuntu.com trusty-updates/universe i386 Packages Hit http://de.archive.ubuntu.com trusty-updates/multiverse i386 Packages Hit http://de.archive.ubuntu.com trusty-updates/multiverse Translation-en Hit http://de.archive.ubuntu.com trusty-updates/restricted Translation-en Hit http://de.archive.ubuntu.com trusty-updates/universe Translation-en Get:1 http://de.archive.ubuntu.com trusty-updates/main Sources [138 kB] Get:2 http://de.archive.ubuntu.com trusty-updates/main Translation-en [161 kB] Fetched 299 kB in 6s (48.1 kB/s) W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/source/Sources Hash Sum mismatch W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/i18n/Translation-en Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead. # cp -a /etc/apt/sources.list /etc/apt/sources.list.ch # mv /etc/apt/sources.list /etc/apt/sources.list.de # ln -s sources.list.ch /etc/apt/sources.list # vim /etc/apt/sources.list.ch deb http://ch.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb http://ch.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse # nslookup ch.archive.ubuntu.com Server: 127.0.0.1 Address: 127.0.0.1#53 Non-authoritative answer: ch.archive.ubuntu.com canonical name = mirror.switch.ch. mirror.switch.ch canonical name = frisal.switch.ch. Name: frisal.switch.ch Address: 130.59.10.36 # LANG=en_us apt-get update Ign http://security.ubuntu.com trusty-security InRelease Hit http://security.ubuntu.com trusty-security Release.gpg Ign http://ch.archive.ubuntu.com trusty InRelease Hit http://security.ubuntu.com trusty-security Release Ign http://ch.archive.ubuntu.com trusty-updates InRelease Hit http://security.ubuntu.com trusty-security/main Sources Get:1 http://ch.archive.ubuntu.com trusty Release.gpg [933 B] Hit http://security.ubuntu.com trusty-security/restricted Sources Get:2 http://ch.archive.ubuntu.com trusty-updates Release.gpg [933 B] Hit http://security.ubuntu.com trusty-security/universe Sources Hit http://security.ubuntu.com trusty-security/multiverse Sources Hit http://security.ubuntu.com trusty-security/main amd64 Packages Get:3 http://ch.archive.ubuntu.com trusty Release [58.5 kB] Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages Hit http://security.ubuntu.com trusty-security/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages Hit http://security.ubuntu.com trusty-security/main i386 Packages Hit http://security.ubuntu.com trusty-security/restricted i386 Packages Hit http://security.ubuntu.com trusty-security/universe i386 Packages Get:4 http://ch.archive.ubuntu.com trusty-updates Release [62.0 kB] Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages Hit http://security.ubuntu.com trusty-security/main Translation-en Hit http://security.ubuntu.com trusty-security/multiverse Translation-en Hit http://security.ubuntu.com trusty-security/restricted Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Get:5 http://ch.archive.ubuntu.com trusty/main Sources [1064 kB] Get:6 http://ch.archive.ubuntu.com trusty/restricted Sources [5433 B] Get:7 http://ch.archive.ubuntu.com trusty/universe Sources [6399 kB] Get:8 http://ch.archive.ubuntu.com trusty/multiverse Sources [174 kB] Get:9 http://ch.archive.ubuntu.com trusty/main amd64 Packages [1350 kB] Get:10 http://ch.archive.ubuntu.com trusty/restricted amd64 Packages [13.0 kB] Get:11 http://ch.archive.ubuntu.com trusty/universe amd64 Packages [5859 kB] Get:12 http://ch.archive.ubuntu.com trusty/multiverse amd64 Packages [132 kB] Get:13 http://ch.archive.ubuntu.com trusty/main i386 Packages [1348 kB] Get:14 http://ch.archive.ubuntu.com trusty/restricted i386 Packages [13.4 kB] Get:15 http://ch.archive.ubuntu.com trusty/universe i386 Packages [5866 kB] Get:16 http://ch.archive.ubuntu.com trusty/multiverse i386 Packages [134 kB] Get:17 http://ch.archive.ubuntu.com trusty/main Translation-en [762 kB] Get:18 http://ch.archive.ubuntu.com trusty/main Translation-de [672 kB] Get:19 http://ch.archive.ubuntu.com trusty/multiverse Translation-en [102 kB] Get:20 http://ch.archive.ubuntu.com trusty/multiverse Translation-de [107 kB] Get:21 http://ch.archive.ubuntu.com trusty/restricted Translation-en [3457 B] Get:22 http://ch.archive.ubuntu.com trusty/restricted Translation-de [3696 B] Get:23 http://ch.archive.ubuntu.com trusty/universe Translation-en [4089 kB] Get:24 http://ch.archive.ubuntu.com trusty/universe Translation-de [2219 kB] Get:25 http://ch.archive.ubuntu.com trusty-updates/main Sources [137 kB] Get:26 http://ch.archive.ubuntu.com trusty-updates/restricted Sources [1408 B] Get:27 http://ch.archive.ubuntu.com trusty-updates/universe Sources [90.7 kB] Get:28 http://ch.archive.ubuntu.com trusty-updates/multiverse Sources [3536 B] Get:29 http://ch.archive.ubuntu.com trusty-updates/main amd64 Packages [357 kB] Get:30 http://ch.archive.ubuntu.com trusty-updates/restricted amd64 Packages [5820 B] Get:31 http://ch.archive.ubuntu.com trusty-updates/universe amd64 Packages [219 kB] Get:32 http://ch.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [9381 B] Get:33 http://ch.archive.ubuntu.com trusty-updates/main i386 Packages [353 kB] Get:34 http://ch.archive.ubuntu.com trusty-updates/restricted i386 Packages [5820 B] Get:35 http://ch.archive.ubuntu.com trusty-updates/universe i386 Packages [219 kB] Get:36 http://ch.archive.ubuntu.com trusty-updates/multiverse i386 Packages [9532 B] Get:37 http://ch.archive.ubuntu.com trusty-updates/main Translation-en [162 kB] Get:38 http://ch.archive.ubuntu.com trusty-updates/multiverse Translation-en [4719 B] Get:39 http://ch.archive.ubuntu.com trusty-updates/restricted Translation-en [1736 B] Get:40 http://ch.archive.ubuntu.com trusty-updates/universe Translation-en [110 kB] Fetched 32.1 MB in 1min 7s (473 kB/s) Reading package lists... Done