gconfsharp2-schemagen: 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/gconfsharp2-schemagen - from package: libgconf2.0-cil-dev

You may install the required package with command apt-get install {package}
Error in other languages:
gconfsharp2-schemagen: bevel nie gevind nie
gconfsharp2-schemagen: comandă negăsită
gconfsharp2-schemagen: comando não encontrado
gconfsharp2-schemagen: commande introuvable
gconfsharp2-schemagen: command not found
gconfsharp2-schemagen: käsku ei ole
gconfsharp2-schemagen: không tìm thấy lệnh
gconfsharp2-schemagen: komanda nerasta
gconfsharp2-schemagen: Kommando nicht gefunden.
gconfsharp2-schemagen: kommandot finns inte
gconfsharp2-schemagen: komut yok
gconfsharp2-schemagen: nie znaleziono polecenia
gconfsharp2-schemagen: níor aimsíodh an t-ordú
gconfsharp2-schemagen: no se encontró la orden
gconfsharp2-schemagen: no s'ha trobat l'ordre
gconfsharp2-schemagen: opdracht niet gevonden
gconfsharp2-schemagen: parancs nem található
gconfsharp2-schemagen: perintah tidak ditemukan
gconfsharp2-schemagen: príkaz nenájdený
gconfsharp2-schemagen: příkaz nenalezen
gconfsharp2-schemagen: команда не найдена
gconfsharp2-schemagen: командата не е открита
gconfsharp2-schemagen: 命令找不到
gconfsharp2-schemagen: コマンドが見つかりません