regionset: 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/sbin/regionset - from package: regionset

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

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