Информация об обновлении устарела

Как мне исправить проблему с обновлением. Я использую Maverick 10.10 и обновляю ежедневно, однако я получаю предупреждающий треугольник, который говорит мне, что информация об обновлении устарела. После того, как я произвожу обновление, оно говорит мне, что это было последнее обновление 26 дней назад.

После просмотра списка источников в /etc/apt/sources.list он показывает следующее:

# deb cdrom:[Ubuntu 10.10 _Maverick Meerkat_ - Release i386 (20101007)]/ maverick main restricted
# See http:/ /help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http:// mirror01.th.ifl.net/ubuntu/ maverick main restricted
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirror01.th.ifl.net/ubuntu/ maverick-updates main restricted
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://mirror01.th.ifl.net/ubuntu/ maverick universe
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick universe
deb http://mirror01.th.ifl.net/ubuntu/ maverick-updates universe
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://mirror01.th.ifl.net/ubuntu/ maverick multiverse
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick multiverse
deb http://mirror01.th.ifl.net/ubuntu/ maverick-updates multiverse
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://gb.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse
# deb-src http://gb.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu maverick partner
# deb-src http://archive.canonical.com/ubuntu maverick partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu maverick main
deb-src http://extras.ubuntu.com/ubuntu maverick main

deb http://mirror01.th.ifl.net/ubuntu/ maverick-security main restricted
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-security main restricted
deb http://mirror01.th.ifl.net/ubuntu/ maverick-security universe
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-security universe
deb http://mirror01.th.ifl.net/ubuntu/ maverick-security multiverse
deb-src http://mirror01.th.ifl.net/ubuntu/ maverick-security multiverse
deb http://ppa.launchpad.net/awn-testing/ubuntu hardy main
deb-src http://ppa.launchpad.net/awn-testing/ubuntu hardy main
#E-UAE and other funky Amiga stuff
deb http://ppa.launchpad.net/bjfs/ppa/ubuntu jaunty main