deb-gview: 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/deb-gview - from package: deb-gview

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

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