kactivitymanagerd: 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/kactivitymanagerd - from package: libkactivities-bin

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

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