dillo: 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/dillo - from package: dillo

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