I try to run Cleven 4.1 with KP51 from a terminal and I saw the reason why it fails to work : it asks me the root password on the terminal. But I don't know it . Someone knows how to get this password ? I remember, for another application, I had to install a package which avoid the same password issue but I forgot this package name. Otherwise, I tried to run it after a "sudo gainroot" but it fails to start : "Failed to open connection to "session" message bus: (null)". EDIT : I find out that the "cleven.sudoers" file was not copy by the Cleven package instalation. However, when I try to copy it myself, there is no behavior change (it still ask for a password). EDIT2 : Problem solved, run "update-sudoers" command with root priviledges. Now, Cleven is operational on my phone with KP51 .