pbmto10x: 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/pbmto10x - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pbmto10x - from package: netpbm

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

Error in other languages:
pbmto10x: bevel nie gevind nie
pbmto10x: comandă negăsită
pbmto10x: comando não encontrado
pbmto10x: commande introuvable
pbmto10x: command not found
pbmto10x: käsku ei ole
pbmto10x: không tìm thấy lệnh
pbmto10x: komanda nerasta
pbmto10x: Kommando nicht gefunden.
pbmto10x: kommandot finns inte
pbmto10x: komut yok
pbmto10x: nie znaleziono polecenia
pbmto10x: níor aimsíodh an t-ordú
pbmto10x: no se encontró la orden
pbmto10x: no s'ha trobat l'ordre
pbmto10x: opdracht niet gevonden
pbmto10x: parancs nem található
pbmto10x: perintah tidak ditemukan
pbmto10x: príkaz nenájdený
pbmto10x: příkaz nenalezen
pbmto10x: команда не найдена
pbmto10x: командата не е открита
pbmto10x: 命令找不到
pbmto10x: コマンドが見つかりません