lsh-authorize: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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/lsh-authorize - from package: lsh-utils

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