I recently installed 12.04 but am unable to run sudo apt-get update and consequently sudo apt-get install xxx. When I run the first command I get several

Ign http://extras.ubuntu.com precise InRelease

and

Err http://extras.ubuntu.com precise release.gpg Unable to connect to extras.ubuntu.com

It works fine to wget extras.ubuntu.com.

My /etc/apt/sources.list is the original file with swedish mirrors se.archive.ubuntu.com/ubuntu. For what it is worth I have tried other mirrors with the same result. My sources.list can be found here.

Update

I am aware that there are many questions like this one, no one has helped me though. I performed the following commands with no change in result.

sudo mv /etc/apt/sources.list /etc/apt/sources.list.backup

sudo vi /etc/apt/sources.list

and pasted

################### OFFICIAL UBUNTU REPOS ###################

###### Ubuntu Main Repos

deb http://se.archive.ubuntu.com/ubuntu/ precise main 

deb-src http://se.archive.ubuntu.com/ubuntu/ precise main



###### Ubuntu Update Repos

deb http://se.archive.ubuntu.com/ubuntu/ precise-security main 

deb http://se.archive.ubuntu.com/ubuntu/ precise-updates main 

deb http://se.archive.ubuntu.com/ubuntu/ precise-proposed main 

deb http://se.archive.ubuntu.com/ubuntu/ precise-backports main 

deb-src http://se.archive.ubuntu.com/ubuntu/ precise-security main 

deb-src http://se.archive.ubuntu.com/ubuntu/ precise-updates main 

deb-src http://se.archive.ubuntu.com/ubuntu/ precise-proposed main 

deb-src http://se.archive.ubuntu.com/ubuntu/ precise-backports main

Output from wget -S --spider http://extras.ubuntu.com

Spider mode enabled. Check if remote file exists.

--2012-07-16 14:06:21--  http://extras.ubuntu.com/

Resolving ...

Connecting to ... connected.

Proxy request sent, awaiting response... 

  HTTP/1.1 200 OK

  Date: Mon, 16 Jul 2012 10:05:19 GMT

  Server: Apache/2.2.8 (Ubuntu)

  Content-Type: text/html;charset=UTF-8

  Connection: close

Length: unspecified [text/html]

Remote file exists and could contain further links,

but recursion is disabled -- not retrieving.

Output from apt-config dump

APT "";

APT::Architecture "i386";

APT::Build-Essential "";

APT::Build-Essential:: "build-essential";

APT::Install-Recommends "1";

APT::Install-Suggests "0";

APT::Authentication "";

APT::Authentication::TrustCDROM "true";

APT::NeverAutoRemove "";

APT::NeverAutoRemove:: "^firmware-linux.*";

APT::NeverAutoRemove:: "^linux-firmware$";

APT::NeverAutoRemove:: "^linux-image.*";

APT::NeverAutoRemove:: "^kfreebsd-image.*";

APT::NeverAutoRemove:: "^linux-restricted-modules.*";

APT::NeverAutoRemove:: "^linux-ubuntu-modules-.*";

APT::NeverAutoRemove:: "^gnumach$";

APT::NeverAutoRemove:: "^gnumach-image.*";

APT::Never-MarkAuto-Sections "";

APT::Never-MarkAuto-Sections:: "metapackages";

APT::Never-MarkAuto-Sections:: "restricted/metapackages";

APT::Never-MarkAuto-Sections:: "universe/metapackages";

APT::Never-MarkAuto-Sections:: "multiverse/metapackages";

APT::Never-MarkAuto-Sections:: "oldlibs";

APT::Never-MarkAuto-Sections:: "restricted/oldlibs";

APT::Never-MarkAuto-Sections:: "universe/oldlibs";

APT::Never-MarkAuto-Sections:: "multiverse/oldlibs";

APT::Periodic "";

APT::Periodic::Update-Package-Lists "1";

APT::Periodic::Download-Upgradeable-Packages "0";

APT::Periodic::AutocleanInterval "0";

APT::Update "";

APT::Update::Post-Invoke-Success "";

APT::Update::Post-Invoke-Success:: "touch /var/lib/apt/periodic/update-success-stamp 2>/dev/null || true";

APT::Update::Post-Invoke-Success:: "[ ! -f /var/run/dbus/system_bus_socket ] || /usr/bin/dbus-send --system --dest=org.debian.apt --type=signal /org/debian/apt org.debian.apt.CacheChanged || true";

APT::Archives "";

APT::Archives::MaxAge "30";

APT::Archives::MinAge "2";

APT::Archives::MaxSize "500";

APT::Changelogs "";

APT::Changelogs::Server "http://changelogs.ubuntu.com/changelogs";

APT::Architectures "";

APT::Architectures:: "i386";

APT::Compressor "";

APT::Compressor::. "";

APT::Compressor::.::Name ".";

APT::Compressor::.::Extension "";

APT::Compressor::.::Binary "";

APT::Compressor::.::Cost "1";

APT::Compressor::.::CompressArg "";

APT::Compressor::.::CompressArg:: "";

APT::Compressor::.::UncompressArg "";

APT::Compressor::.::UncompressArg:: "";

APT::Compressor::gzip "";

APT::Compressor::gzip::Name "gzip";

APT::Compressor::gzip::Extension ".gz";

APT::Compressor::gzip::Binary "gzip";

APT::Compressor::gzip::Cost "2";

APT::Compressor::gzip::CompressArg "";

APT::Compressor::gzip::CompressArg:: "-9n";

APT::Compressor::gzip::UncompressArg "";

APT::Compressor::gzip::UncompressArg:: "-d";

APT::Compressor::bzip2 "";

APT::Compressor::bzip2::Name "bzip2";

APT::Compressor::bzip2::Extension ".bz2";

APT::Compressor::bzip2::Binary "bzip2";

APT::Compressor::bzip2::Cost "3";

APT::Compressor::bzip2::CompressArg "";

APT::Compressor::bzip2::CompressArg:: "-9";

APT::Compressor::bzip2::UncompressArg "";

APT::Compressor::bzip2::UncompressArg:: "-d";

APT::Compressor::lzma "";

APT::Compressor::lzma::Name "lzma";

APT::Compressor::lzma::Extension ".lzma";

APT::Compressor::lzma::Binary "lzma";

APT::Compressor::lzma::Cost "4";

APT::Compressor::lzma::CompressArg "";

APT::Compressor::lzma::CompressArg:: "-9";

APT::Compressor::lzma::UncompressArg "";

APT::Compressor::lzma::UncompressArg:: "-d";

APT::Compressor::xz "";

APT::Compressor::xz::Name "xz";

APT::Compressor::xz::Extension ".xz";

APT::Compressor::xz::Binary "xz";

APT::Compressor::xz::Cost "5";

APT::Compressor::xz::CompressArg "";

APT::Compressor::xz::CompressArg:: "-6";

APT::Compressor::xz::UncompressArg "";

APT::Compressor::xz::UncompressArg:: "-d";

Dir "/";

Dir::State "var/lib/apt/";

Dir::State::lists "lists/";

Dir::State::cdroms "cdroms.list";

Dir::State::mirrors "mirrors/";

Dir::State::extended_states "extended_states";

Dir::State::status "/var/lib/dpkg/status";

Dir::Cache "var/cache/apt/";

Dir::Cache::archives "archives/";

Dir::Cache::srcpkgcache "srcpkgcache.bin";

Dir::Cache::pkgcache "pkgcache.bin";

Dir::Etc "etc/apt/";

Dir::Etc::sourcelist "sources.list";

Dir::Etc::sourceparts "sources.list.d";

Dir::Etc::vendorlist "vendors.list";

Dir::Etc::vendorparts "vendors.list.d";

Dir::Etc::main "apt.conf";

Dir::Etc::netrc "auth.conf";

Dir::Etc::parts "apt.conf.d";

Dir::Etc::preferences "preferences";

Dir::Etc::preferencesparts "preferences.d";

Dir::Etc::trusted "trusted.gpg";

Dir::Etc::trustedparts "trusted.gpg.d";

Dir::Bin "";

Dir::Bin::methods "/usr/lib/apt/methods";

Dir::Bin::solvers "";

Dir::Bin::solvers:: "/usr/lib/apt/solvers";

Dir::Bin::dpkg "/usr/bin/dpkg";

Dir::Bin::lzma "/usr/bin/lzma";

Dir::Bin::xz "/usr/bin/xz";

Dir::Bin::bzip2 "/bin/bzip2";

Dir::Media "";

Dir::Media::MountPath "/media/apt";

Dir::Log "var/log/apt";

Dir::Log::Terminal "term.log";

Dir::Log::History "history.log";

Dir::Ignore-Files-Silently "";

Dir::Ignore-Files-Silently:: "~$";

Dir::Ignore-Files-Silently:: ".disabled$";

Dir::Ignore-Files-Silently:: ".bak$";

Dir::Ignore-Files-Silently:: ".dpkg-[a-z]+$";

Dir::Ignore-Files-Silently:: ".save$";

Dir::Ignore-Files-Silently:: ".orig$";

Dir::Ignore-Files-Silently:: ".distUpgrade$";

Acquire "";

Acquire::cdrom "";

Acquire::cdrom::mount "/media/cdrom/";

Acquire::Languages "";

Acquire::Languages:: "en_US";

Acquire::Languages:: "en";

Acquire::Languages:: "none";

Aptitude "";

Aptitude::Get-Root-Command "sudo:/usr/bin/sudo";

Unattended-Upgrade "";

Unattended-Upgrade::Allowed-Origins "";

Unattended-Upgrade::Allowed-Origins:: "${distro_id}:${distro_codename}-security";

DPkg "";

DPkg::Pre-Install-Pkgs "";

DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";

DPkg::Post-Invoke "";

DPkg::Post-Invoke:: "if [ -d /var/lib/update-notifier ]; then touch /var/lib/update-notifier/dpkg-run-stamp; fi; if [ -e /var/lib/update-notifier/updates-available ]; then echo > /var/lib/update-notifier/updates-available; fi ";

CommandLine "";

CommandLine::AsString "apt-config dump";