mktemp: 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:

/bin/mktemp - from package: coreutils

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

On Debian possible default full paths are:

/bin/mktemp - from package: coreutils

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

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