flexlink: 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/flexlink - from package: flexdll

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

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