libglade-convert: 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 CentOS possible default full paths are:

/usr/bin/libglade-convert - from package: libglade2-devel

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/libglade-convert - from package: libglade2-dev

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

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