refdb_latex2utf8txt: 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/refdb_latex2utf8txt - from package: refdb-clients

You may install the required package with command apt-get install {package}
Error in other languages:
refdb_latex2utf8txt: bevel nie gevind nie
refdb_latex2utf8txt: comandă negăsită
refdb_latex2utf8txt: comando não encontrado
refdb_latex2utf8txt: commande introuvable
refdb_latex2utf8txt: command not found
refdb_latex2utf8txt: käsku ei ole
refdb_latex2utf8txt: không tìm thấy lệnh
refdb_latex2utf8txt: komanda nerasta
refdb_latex2utf8txt: Kommando nicht gefunden.
refdb_latex2utf8txt: kommandot finns inte
refdb_latex2utf8txt: komut yok
refdb_latex2utf8txt: nie znaleziono polecenia
refdb_latex2utf8txt: níor aimsíodh an t-ordú
refdb_latex2utf8txt: no se encontró la orden
refdb_latex2utf8txt: no s'ha trobat l'ordre
refdb_latex2utf8txt: opdracht niet gevonden
refdb_latex2utf8txt: parancs nem található
refdb_latex2utf8txt: perintah tidak ditemukan
refdb_latex2utf8txt: príkaz nenájdený
refdb_latex2utf8txt: příkaz nenalezen
refdb_latex2utf8txt: команда не найдена
refdb_latex2utf8txt: командата не е открита
refdb_latex2utf8txt: 命令找不到
refdb_latex2utf8txt: コマンドが見つかりません