falselogin: command not found

Have You tried accessing the binary with the full path?

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/falselogin - from package: falselogin

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