lldb: 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 Debian possible default full paths are:

/usr/lib/llvm-3.4/bin/lldb - from package: lldb-3.4
/usr/lib/llvm-3.5/bin/lldb - from package: lldb-3.5
/usr/bin/lldb - from package: lldb

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

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