pk2bm: 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/pk2bm - from package: texlive

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

On Debian possible default full paths are:

/usr/bin/pk2bm - from package: texlive-binaries

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

Error in other languages:
pk2bm: bevel nie gevind nie
pk2bm: comandă negăsită
pk2bm: comando não encontrado
pk2bm: commande introuvable
pk2bm: command not found
pk2bm: käsku ei ole
pk2bm: không tìm thấy lệnh
pk2bm: komanda nerasta
pk2bm: Kommando nicht gefunden.
pk2bm: kommandot finns inte
pk2bm: komut yok
pk2bm: nie znaleziono polecenia
pk2bm: níor aimsíodh an t-ordú
pk2bm: no se encontró la orden
pk2bm: no s'ha trobat l'ordre
pk2bm: opdracht niet gevonden
pk2bm: parancs nem található
pk2bm: perintah tidak ditemukan
pk2bm: príkaz nenájdený
pk2bm: příkaz nenalezen
pk2bm: команда не найдена
pk2bm: командата не е открита
pk2bm: 命令找不到
pk2bm: コマンドが見つかりません