jbgtopbm: 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/jbgtopbm - from package: jbigkit-bin

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