valgrind-di-server: 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/valgrind-di-server - from package: valgrind

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

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