14.04 - apt-get update stalls

When I run

sudo apt-get update

the update fails to finish. This is the result in the console:

Get:1 http://repository.spotify.com stable InRelease [2,980 B]
Hit http://download.virtualbox.org trusty InRelease
Hit http://repo.steampowered.com precise InRelease
Ign http://repository.spotify.com stable InRelease
Hit http://downloads.hipchat.com stable InRelease
Hit http://download.virtualbox.org trusty/contrib amd64 Packages
Hit http://downloads.hipchat.com stable/main amd64 Packages
Ign http://toolbelt.heroku.com ./ InRelease
Hit http://download.virtualbox.org trusty/non-free amd64 Packages
Ign http://ppa.launchpad.net trusty InRelease
Ign http://extras.ubuntu.com trusty InRelease
Hit http://download.virtualbox.org trusty/contrib i386 Packages
Get:2 http://repos.codelite.org saucy InRelease [2,893 B]
Hit http://downloads.hipchat.com stable/main i386 Packages
Ign http://repos.codelite.org saucy InRelease
Hit http://download.virtualbox.org trusty/non-free i386 Packages
Hit http://toolbelt.heroku.com ./ Release.gpg
Hit http://extras.ubuntu.com trusty Release.gpg
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://repository.spotify.com stable/non-free amd64 Packages/DiffIndex
Hit http://repo.steampowered.com precise/steam Sources
Ign http://repository.spotify.com stable/non-free i386 Packages/DiffIndex
Ign http://repos.codelite.org saucy/universe amd64 Packages/DiffIndex
Hit http://toolbelt.heroku.com ./ Release
Hit http://extras.ubuntu.com trusty Release
Hit http://ppa.launchpad.net trusty Release
Ign http://repos.codelite.org saucy/universe i386 Packages/DiffIndex
Hit http://extras.ubuntu.com trusty/main Sources
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://repo.steampowered.com precise/steam amd64 Packages
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://extras.ubuntu.com trusty/main i386 Packages
Hit http://toolbelt.heroku.com ./ Packages
Hit http://repo.steampowered.com precise/steam i386 Packages
Ign http://download.virtualbox.org trusty/contrib Translation-en_US
Ign http://download.virtualbox.org trusty/contrib Translation-en
Ign http://downloads.hipchat.com stable/main Translation-en_US
Ign http://download.virtualbox.org trusty/non-free Translation-en_US
Ign http://download.virtualbox.org trusty/non-free Translation-en
Ign http://downloads.hipchat.com stable/main Translation-en
Ign http://toolbelt.heroku.com ./ Translation-en_US
Ign http://toolbelt.heroku.com ./ Translation-en
Hit http://repository.spotify.com stable/non-free amd64 Packages
Hit http://repository.spotify.com stable/non-free i386 Packages
Ign http://repository.spotify.com stable/non-free Translation-en_US
Ign http://repository.spotify.com stable/non-free Translation-en
Ign http://ppa.launchpad.net trusty/main Translation-en_US
Ign http://extras.ubuntu.com trusty/main Translation-en_US
Ign http://ppa.launchpad.net trusty/main Translation-en
Ign http://extras.ubuntu.com trusty/main Translation-en
Hit http://repos.codelite.org saucy/universe amd64 Packages
Hit http://repos.codelite.org saucy/universe i386 Packages
Ign http://repos.codelite.org saucy/universe Translation-en_US
Ign http://repo.steampowered.com precise/steam Translation-en_US
Ign http://repos.codelite.org saucy/universe Translation-en
Ign http://repo.steampowered.com precise/steam Translation-en
100% [Connecting to archive.ubuntu.com (2001:67c:1360:8c01::19)] [Connecting to dl.google.com (2607:f8b0:4002:802::1005)]`

At this point it stops doing anything. I tried massing with my ppa settings, as well as my download-from location, but nothing seemed to change.

Here's what shows up when I run ifconfig:

ifconfig
eth0      Link encap:Ethernet  HWaddr 10:bf:48:6e:db:61
      UP BROADCAST MULTICAST  MTU:1500  Metric:1
      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
      TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
lo        Link encap:Local Loopback
      inet addr:127.0.0.1  Mask:255.0.0.0
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:65536  Metric:1
      RX packets:33721 errors:0 dropped:0 overruns:0 frame:0
      TX packets:33721 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0
      RX bytes:4158224 (4.1 MB)  TX bytes:4158224 (4.1 MB)
wlan0     Link encap:Ethernet  HWaddr e0:06:e6:2a:3a:bb
      inet addr:192.168.2.23  Bcast:192.168.2.255  Mask:255.255.255.0
      inet6 addr: 2601:0:b680:1d8:f240:a5c6:a9af:2df/128 Scope:Global
      inet6 addr: fe80::e206:e6ff:fe2a:3abb/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:5214256 errors:0 dropped:1 overruns:0 frame:0
      TX packets:2724566 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:7298102756 (7.2 GB)  TX bytes:274205022 (274.2 MB)

It looks like your IPv6 connection is misconfigured, either by Ubuntu or by Comcast. As a (temporary) workaround, open up the wireless network's setitngs in Network Manager, switch to the IPv6 tab and change it from Automatic to Disabled. Disconnect and reconnect your wireless connection.