dpkg-hold: command not found

Have You tried accessing the binary with the full path?

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/dpkg-hold - from package: dlocate

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