dgtst-long: 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/bin/dgtst-long - from package: ptscotch

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