lsinitrd: 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:

/sbin/lsinitrd - from package: dracut

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

On Debian possible default full paths are:

/usr/bin/lsinitrd - from package: dracut

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

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