lsh-pam-checkpw: 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/sbin/lsh-pam-checkpw - from package: lsh-server

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

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