Thread: Source.list totally messed up!

hey guys, need help. changed source.list text , lost backup can't update or install anything. wondering if provide me default source.list text ubuntu 10.04.

synaptic manager says:

e: dynamic mmap corrió fuera de la sala. incremente el tamaño de apt::cache-limit. valor actual: 25165824. (man 5 apt.conf)
e: ocurrió un error mientras se procesaba simple-scan (newversion1)
e: problem mergelist /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_lucid-updates_main_binary-amd64_packages
e: las listas de paquetes o el archivo de estado no se pueden analizar sintácticamente o abrir.
e: _cache->open() failed, please report.

w: unable munmap

things in spanish, know, think more experienced linux users should recognize of problems i'm having.

looks complicated , not expert in linux yet. please guys, me. in advance, cheers.

#deb cdrom:[ubuntu 10.04 lts _lucid lynx_ - release amd64 (20100429)]/ lucid main restricted
# see http://help.ubuntu.com/community/upgradenotes how upgrade to
# newer versions of distribution.

deb http://us.archive.ubuntu.com/ubuntu/ lucid main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid main restricted

## major bug fix updates produced after final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates main restricted

## n.b. software repository entirely unsupported ubuntu
## team. also, please note software in universe not receive any
## review or updates ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ lucid universe
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid universe
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates universe

## n.b. software repository entirely unsupported ubuntu
## team, , may not under free licence. please satisfy
## rights use software. also, please note software in
## multiverse not receive review or updates ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ lucid multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid multiverse
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates multiverse

## uncomment following 2 lines add software 'backports'
## repository.
## n.b. software repository may not have been tested as
## extensively contained in main release, although includes
## newer versions of applications may provide useful features.
## also, please note software in backports not receive review
## or updates ubuntu security team.
# deb http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse

## uncomment following 2 lines add software canonical's
## 'partner' repository.
## software not part of ubuntu, offered canonical , the
## respective vendors service ubuntu users.
# deb http://archive.canonical.com/ubuntu lucid partner
# deb-src http://archive.canonical.com/ubuntu lucid partner

deb http://security.ubuntu.com/ubuntu lucid-security main restricted
deb-src http://security.ubuntu.com/ubuntu lucid-security main restricted
deb http://security.ubuntu.com/ubuntu lucid-security universe
deb-src http://security.ubuntu.com/ubuntu lucid-security universe
deb http://security.ubuntu.com/ubuntu lucid-security multiverse
deb-src http://security.ubuntu.com/ubuntu lucid-security multiverse

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