I thought that the first person to answer to me (hopefully) would ask me what was the output on the console so here it is:
kostas@todeli:~$ sudo gedit /etc/apt/sources.list.d/openoffice.list
[sudo] password for kostas:
< The file was empty and I added a line like you see below >
kostas@todeli:~$ cat /etc/apt/sources.list.d/openoffice.list
deb
http://ppa.launchpad.net/openoffice-pkgs/ubuntu intrepid main
kostas@todeli:~$ sudo apt-get update
Hit
http://ppa.launchpad.net intrepid Release.gpg
Ign
http://ppa.launchpad.net intrepid/main Translation-en_US
Hit
http://security.ubuntu.com intrepid-security Release.gpg
Ign
http://security.ubuntu.com intrepid-security/main Translation-en_US
Hit
http://ppa.launchpad.net intrepid Release
Ign
http://security.ubuntu.com intrepid-security/restricted Translation-en_US
Ign
http://security.ubuntu.com intrepid-security/universe Translation-en_US
Ign
http://security.ubuntu.com intrepid-security/multiverse Translation-en_US
Hit
http://security.ubuntu.com intrepid-security Release
Hit
http://ppa.launchpad.net intrepid/main Packages
Hit
http://security.ubuntu.com intrepid-security/main Packages
Hit
http://security.ubuntu.com intrepid-security/restricted Packages
Hit
http://security.ubuntu.com intrepid-security/main Sources
Hit
http://security.ubuntu.com intrepid-security/restricted Sources
Hit
http://security.ubuntu.com intrepid-security/universe Packages
Hit
http://security.ubuntu.com intrepid-security/universe Sources
Hit
http://security.ubuntu.com intrepid-security/multiverse Packages
Hit
http://security.ubuntu.com intrepid-security/multiverse Sources
Hit
http://gr.archive.ubuntu.com intrepid Release.gpg
Ign
http://gr.archive.ubuntu.com intrepid/main Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid/restricted Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid/universe Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid/multiverse Translation-en_US
Get:1
http://gr.archive.ubuntu.com intrepid-updates Release.gpg [189B]
Ign
http://gr.archive.ubuntu.com intrepid-updates/main Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid-updates/restricted Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid-updates/universe Translation-en_US
Ign
http://gr.archive.ubuntu.com intrepid-updates/multiverse Translation-en_US
Hit
http://gr.archive.ubuntu.com intrepid Release
Get:2
http://gr.archive.ubuntu.com intrepid-updates Release [51.2kB]
Hit
http://gr.archive.ubuntu.com intrepid/main Packages
Hit
http://gr.archive.ubuntu.com intrepid/restricted Packages
Hit
http://gr.archive.ubuntu.com intrepid/main Sources
Hit
http://gr.archive.ubuntu.com intrepid/restricted Sources
Hit
http://gr.archive.ubuntu.com intrepid/universe Packages
Hit
http://gr.archive.ubuntu.com intrepid/universe Sources
Hit
http://gr.archive.ubuntu.com intrepid/multiverse Packages
Hit
http://gr.archive.ubuntu.com intrepid/multiverse Sources
Get:3
http://gr.archive.ubuntu.com intrepid-updates/main Packages [368kB]
Get:4
http://gr.archive.ubuntu.com intrepid-updates/restricted Packages [8440B]
Get:5
http://gr.archive.ubuntu.com intrepid-updates/main Sources [117kB]
Get:6
http://gr.archive.ubuntu.com intrepid-updates/restricted Sources [2471B]
Get:7
http://gr.archive.ubuntu.com intrepid-updates/universe Packages [128kB]
Get:8
http://gr.archive.ubuntu.com intrepid-updates/universe Sources [32.2kB]
Get:9
http://gr.archive.ubuntu.com intrepid-updates/multiverse Packages [13.0kB]
Get:10
http://gr.archive.ubuntu.com intrepid-updates/multiverse Sources [4678B]
Fetched 726kB in 17s (42.6kB/s)
Reading package lists... Done
W: Duplicate sources.list entry
http://ppa.launchpad.net intrepid/main Packages (/var/lib/apt/lists/ppa.launchpad.net_openoffice-pkgs_ubuntu_dists_intrepid_main_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems
kostas@todeli:~$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
kostas@todeli:~$
