context: 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/context - from package: context

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

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