kcollectd: 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/kcollectd - from package: kcollectd

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

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