lxc-checkconfig: 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/lxc-checkconfig - from package: lxc

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

On Debian possible default full paths are:

/usr/bin/lxc-checkconfig - from package: lxc

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

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