fixmount: 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/sbin/fixmount - from package: am-utils

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

On Debian possible default full paths are:

/usr/sbin/fixmount - from package: am-utils

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

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