kaddressbook-mobile: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/kaddressbook-mobile - from package: kaddressbook-mobile

You may install the required package with command apt-get install {package}

Error in other languages:
kaddressbook-mobile: bevel nie gevind nie
kaddressbook-mobile: comandă negăsită
kaddressbook-mobile: comando não encontrado
kaddressbook-mobile: commande introuvable
kaddressbook-mobile: command not found
kaddressbook-mobile: käsku ei ole
kaddressbook-mobile: không tìm thấy lệnh
kaddressbook-mobile: komanda nerasta
kaddressbook-mobile: Kommando nicht gefunden.
kaddressbook-mobile: kommandot finns inte
kaddressbook-mobile: komut yok
kaddressbook-mobile: nie znaleziono polecenia
kaddressbook-mobile: níor aimsíodh an t-ordú
kaddressbook-mobile: no se encontró la orden
kaddressbook-mobile: no s'ha trobat l'ordre
kaddressbook-mobile: opdracht niet gevonden
kaddressbook-mobile: parancs nem található
kaddressbook-mobile: perintah tidak ditemukan
kaddressbook-mobile: príkaz nenájdený
kaddressbook-mobile: příkaz nenalezen
kaddressbook-mobile: команда не найдена
kaddressbook-mobile: командата не е открита
kaddressbook-mobile: 命令找不到
kaddressbook-mobile: コマンドが見つかりません