adt-virt-schroot: 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/adt-virt-schroot - from package: autopkgtest

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

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