[gnome-main-menu] Close button in the about window doesn't work

[Yann Papouin]

Toby Smithe wrote:
> This is a bug in the package, and you should file a bug in Malone.
>   
Yes, it was my first idea before posting there but I can't doing that 
because there is no package named gnome-main-menu in Malone !
https://launchpad.net/distros/ubuntu/+allpackages?start=3075&batch=75
So where can I submit a bug report ?