[GRASS-user] Grass repository for Ubuntu 12.04 LTS and duplicate.sources.list error

[Patrick Giraudoux]

Dear all,

 From Ubuntu Ubuntu 12.04 LTS 64bits I am trying to install grass-dev 
using synaptic. I get this error:

W: Duplicate sources.list entry 
http://ppa.launchpad.net/gcpp-kalxas/ppa-tzotsos/ubuntu/ precise/main 
amd64 Packages 
(/var/lib/apt/lists/ppa.launchpad.net_gcpp-kalxas_ppa-tzotsos_ubuntu_dists_precise_main_binary-amd64_Packages)
W: Duplicate sources.list entry 
http://ppa.launchpad.net/gcpp-kalxas/ppa-tzotsos/ubuntu/ precise/main 
i386 Packages 
(/var/lib/apt/lists/ppa.launchpad.net_gcpp-kalxas_ppa-tzotsos_ubuntu_dists_precise_main_binary-i386_Packages)

I understand that there is a duplicate in my sources.list, but cannot 
figure out which one. Here are the repositories that I have added:

# to get GRASS updated
deb http://ppa.launchpad.net/gcpp-kalxas/ppa-tzotsos/ubuntu precise main
deb-src http://ppa.launchpad.net/gcpp-kalxas/ppa-tzotsos/ubuntu precise 
main

# to get QGIS
deb http://qgis.org/debian precise main
deb-src http://qgis.org/debian precise main

# to get R
deb http://cran.univ-lyon1.fr/bin/linux/ubuntu precise/

Any hint appreciated.

Patrick