skx: 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/skx - from package: keyboards-rg

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