每当我运行时，apt-get update我都会得到以下输出：
Hit:1 http://il.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://il.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://il.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [94.5 kB]
Hit:5 http://ppa.launchpad.net/appgrid/stable/ubuntu xenial InRelease
Ign:6 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:8 http://ppa.launchpad.net/nilarimogard/test3/ubuntu xenial InRelease
Hit:9 http://dl.google.com/linux/chrome/deb stable Release
Ign:10 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial InRelease
Ign:11 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial InRelease
Ign:12 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.10 InRelease
Hit:14 http://ppa.launchpad.net/videolan/stable-daily/ubuntu xenial InRelease
Hit:15 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.10 Release
Ign:16 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial Release
Ign:17 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial Release
Hit:7 http://screenshots.getdeb.net xenial-getdeb InRelease
Ign:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Ign:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Ign:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Ign:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Ign:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Ign:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Ign:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Ign:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Ign:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Ign:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Err:19 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 Packages
404 Not Found
Ign:20 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main i386 Packages
Ign:21 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en_US
Ign:23 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main Translation-en
Ign:24 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:25 http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial/main DEP-11 64x64 Icons
Err:26 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 Packages
404 Not Found
Ign:27 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main i386 Packages
Ign:28 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main all Packages
Ign:29 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en_US
Ign:30 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main Translation-en
Ign:31 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:32 http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial/main DEP-11 64x64 Icons
Fetched 94.5 kB in 7s (13.2 kB/s)
/usr/share/appgrid/appdata/helpers.py:9: PyGIWarning: Soup was imported without specifying a version first. Use gi.require_version('Soup', '2.4') before import to ensure that the right version gets loaded.
from gi.repository import GLib, GObject, Soup
Reading package lists... Done
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 3B068FB4789ABE4AEFA3BB491397BC53640DB551 uses weak digest algorithm (SHA1)
W: The repository 'http://ppa.launchpad.net/u2t/bleedingedge/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/u2t/bleedingedge/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/unity-2d-team/unity-2d-daily/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
我一直在尝试按照以下方式安装 Ubuntu TV：https ://wiki.ubuntu.com/UbuntuTV/Contributing
它没有安装。我怎样才能解决这个问题？