When I run the command apt-get install gdb

W: Couldn't stat source package list http://repository.maemo.org diablo/free Packages (/var/lib/apt/lists/repository.maemo.org_dists_diablo_free_binary-armel_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://repository.maemo.org diablo/non-free Packages (/var/lib/apt/lists/repository.maemo.org_dists_diablo_non-free_binary-armel_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Couldn't find package gdb

Then I run the command apt-get update
I got these message:
W: Couldn't stat source package list http://repository.maemo.org diablo/free Packages (/var/lib/apt/lists/repository.maemo.org_dists_diablo_free_binary-armel_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://repository.maemo.org diablo/non-free Packages (/var/lib/apt/lists/repository.maemo.org_dists_diablo_non-free_binary-armel_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.

These index (free/non-free) seem to not exist:
http://repository.maemo.org/dists/diablo

http://www.google.com/search?q=diablo+install+gdb

http://maemo.org/development/documen...ing_languages/
http://maemo.org/development/tools/