umview: 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/umview - from package: umview

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

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