g2c: 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/g2c - from package: goo

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

Error in other languages:
g2c: bevel nie gevind nie
g2c: comandă negăsită
g2c: comando não encontrado
g2c: commande introuvable
g2c: command not found
g2c: käsku ei ole
g2c: không tìm thấy lệnh
g2c: komanda nerasta
g2c: Kommando nicht gefunden.
g2c: kommandot finns inte
g2c: komut yok
g2c: nie znaleziono polecenia
g2c: níor aimsíodh an t-ordú
g2c: no se encontró la orden
g2c: no s'ha trobat l'ordre
g2c: opdracht niet gevonden
g2c: parancs nem található
g2c: perintah tidak ditemukan
g2c: príkaz nenájdený
g2c: příkaz nenalezen
g2c: команда не найдена
g2c: командата не е открита
g2c: 命令找不到
g2c: コマンドが見つかりません