setbrlkeys: 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/setbrlkeys - from package: console-braille

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

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