cefconv: 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/cefconv - from package: texlive-east-asian

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

On Debian possible default full paths are:

/usr/bin/cefconv - from package: latex-cjk-chinese

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

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