krusader: 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/krusader - from package: krusader

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

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