ck-log-system-start: 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/sbin/ck-log-system-start - from package: ConsoleKit

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

On Debian possible default full paths are:

/usr/sbin/ck-log-system-start - from package: ConsoleKit

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

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