gnote: 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/gnote - from package: gnote

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

On Debian possible default full paths are:

/usr/bin/gnote - from package: gnote

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

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