tpm_nvinfo: 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/sbin/tpm_nvinfo - from package: tpm-tools

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

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