lcdproc: 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
/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/lcdproc - from package: lcdproc

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