dgpart-long: 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/dgpart-long - from package: ptscotch

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

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