kalgebramobile: 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/kalgebramobile - from package: kalgebramobile

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

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