Fapropos.awk: 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/share/ferret-vis/bin/Fapropos.awk - from package: ferret-vis

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

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