E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/people.ubuntu.com_%7epitti_langpacks_daily_dapper-updates_._Packages
E: Las listas de paquetes o el archivo de estado no se pueden analizar sintácticamente o abrir.

¿que le pasa a mi apt? hecharme una mano please
Pega el este contenido de tu sources.list es el valido para Chile pero te peude funcionar si el problema es el archivo.
ejecuta en un terminal
sudo nano /etc/apt/sources.list
Ctrl+o guradas Ctrl+x sales
luego ejecuta
sudo apt-get update
# contenido /etc/apt/sources.list
deb http://cl.archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://cl.archive.ubuntu.com/ubuntu/ dapper main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://cl.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://cl.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
## DESCOMENTADAS
#deb http://cl.archive.ubuntu.com/ubuntu/ dapper universe
#deb-src http://cl.archive.ubuntu.com/ubuntu/ dapper universe
## 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.
### Descomentadas
deb http://cl.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
deb-src http://cl.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
# deb http://security.ubuntu.com/ubuntu dapper-security universe
# deb-src http://security.ubuntu.com/ubuntu dapper-security universe
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Somos más que lo que hacemos... mucho más que nuestros logros... mucho más aún que lo que poseemos.