virt-login-shell: 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/virt-login-shell - from package: libvirt-clients

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

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