lft.db: 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/bin/lft.db - from package: traceroute

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

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