contrib não é uma seção válida para os espelhos oficiais do ubuntu, daí a mensagem enigmática de que contrib/source/Sources não pode ser encontrado.
repo.yandex.ru não é oficial listado em link . A seção non-free desse espelho não contém binários nem fontes. Se você quiser usar o espelho Yandex, use mirror.yandex.ru .
Além disso, sua lista de origens de repositório não possui security.ubuntu.com , o que pode causar atualizações de segurança posteriores.
Você deve definir suas fontes de repositório para pelo menos:
deb http://ru.archive.com/ubuntu/ maverick main restricted
deb-src http://ru.archive.com/ubuntu/ maverick main restricted
deb http://security.ubuntu.com/ubuntu/ maverick main-security restricted
deb-src http://security.ubuntu.com/ubuntu/ maverick main-security restricted
Você está perdendo muitos pacotes com esta lista, eu recomendo que você use a lista que foi fornecida em uma nova instalação, salve o texto abaixo como /etc/apt/sources.list :
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ru.archive.ubuntu.com/ubuntu/ maverick main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates main restricted
deb-src http://ru.archive.ubuntu.com/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://ru.archive.ubuntu.com/ubuntu/ maverick universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick universe
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates universe
deb-src http://ru.archive.ubuntu.com/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://ru.archive.ubuntu.com/ubuntu/ maverick multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick multiverse
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates multiverse
deb-src http://ru.archive.ubuntu.com/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://ru.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse
# deb-src http://ru.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://security.ubuntu.com/ubuntu maverick-security main restricted
deb-src http://security.ubuntu.com/ubuntu maverick-security main restricted
deb http://security.ubuntu.com/ubuntu maverick-security universe
deb-src http://security.ubuntu.com/ubuntu maverick-security universe
deb http://security.ubuntu.com/ubuntu maverick-security multiverse
deb-src http://security.ubuntu.com/ubuntu maverick-security multiverse