mysqlbug: 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/mysqlbug - from package: mysql55w-server
/usr/bin/mysqlbug - from package: mysql-server

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

On Debian possible default full paths are:

/usr/bin/mysqlbug - from package: mariadb-client-10.0
/usr/bin/mysqlbug - from package: mysql-client-5.5

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

Error in other languages:
mysqlbug: bevel nie gevind nie
mysqlbug: comandă negăsită
mysqlbug: comando não encontrado
mysqlbug: commande introuvable
mysqlbug: command not found
mysqlbug: käsku ei ole
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mysqlbug: komanda nerasta
mysqlbug: Kommando nicht gefunden.
mysqlbug: kommandot finns inte
mysqlbug: komut yok
mysqlbug: nie znaleziono polecenia
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mysqlbug: команда не найдена
mysqlbug: командата не е открита
mysqlbug: 命令找不到
mysqlbug: コマンドが見つかりません