isdv4-serial-debugger: 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 CentOS possible default full paths are:

/usr/bin/isdv4-serial-debugger - from package: xorg-x11-drv-wacom-devel

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/isdv4-serial-debugger - from package: xserver-xorg-input-wacom

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

Error in other languages:
isdv4-serial-debugger: bevel nie gevind nie
isdv4-serial-debugger: comandă negăsită
isdv4-serial-debugger: comando não encontrado
isdv4-serial-debugger: commande introuvable
isdv4-serial-debugger: command not found
isdv4-serial-debugger: käsku ei ole
isdv4-serial-debugger: không tìm thấy lệnh
isdv4-serial-debugger: komanda nerasta
isdv4-serial-debugger: Kommando nicht gefunden.
isdv4-serial-debugger: kommandot finns inte
isdv4-serial-debugger: komut yok
isdv4-serial-debugger: nie znaleziono polecenia
isdv4-serial-debugger: níor aimsíodh an t-ordú
isdv4-serial-debugger: no se encontró la orden
isdv4-serial-debugger: no s'ha trobat l'ordre
isdv4-serial-debugger: opdracht niet gevonden
isdv4-serial-debugger: parancs nem található
isdv4-serial-debugger: perintah tidak ditemukan
isdv4-serial-debugger: príkaz nenájdený
isdv4-serial-debugger: příkaz nenalezen
isdv4-serial-debugger: команда не найдена
isdv4-serial-debugger: командата не е открита
isdv4-serial-debugger: 命令找不到
isdv4-serial-debugger: コマンドが見つかりません