bibexport: 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 Debian possible default full paths are:

/usr/bin/bibexport - from package: texlive-bibtex-extra

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

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