ltsp-localapps: 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/ltsp-localapps - from package: ltsp-server

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

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