lpsinfo: 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/lpsinfo - from package: mcrl2

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

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