pyevolve-graph: 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/pyevolve-graph - from package: python-pyevolve

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

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