skel_extract: 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/skel_extract - from package: libadios-bin

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

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