uni: 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/uni - from package: uniconf-tools

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

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