afsio: 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/afsio - from package: openafs-client

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